Just consider it as the ends justifying the means. If you don't get the artifacts, somebody else will - somebody who will actually use them to do the princes bidding. Even in the cases where you can destroy the artifact, destroying it only sends it back to oblivion, which merely gives the daedric prince the opportunity to send it back on their whims. If you collect the artifacts, you can put them somewhere safe where they can do no harm to the world. It can take several hundred years before an artifact naturally returns to Oblivion, so if you're so inclined, go dump them at the bottom of the ocean.

Daedra are neither good nor evil. They are essentially a "force" personified

Water can crush a house or drown a puppy, in this way it can do evil. it can also quench your thirst or help a fish to breathe, in this way we pay our homage to water, water can also float logs to a saw mill, we can redirect it's flow, it can suspend a boat and ease transporation of materials, in this way we harness water.

Daedra are no different, most have many facets. For example Sheogorath is both prince of madness, and prince of creativity, both are facets of the same phenomena, and like water, too much creativity, can overwhelm and turn it into an unhinged mind. It can be worshipped, or fearred, it can used for good or for evil - the only difference is that you can talk to a a daedra and have it answer back, unlike water. Daedra may ask morally evil things of YOu, and that is for you to measure and balance (If the god of water said "break a dam and let my waters flow over that village, it's anathema that they hold me back!) the blood would still be on your hands if you obeyed him.

But the entity itself simply is, it has no "evil" or "good" intentions it's merely a force that does what it does.

I took some leeway with lore and created a organization like the blades, which I called the Acquisitioners. They were secretly established by Tiber Septim to acquire any dangerous artifacts, deadric or otherwise, and then store them away from the world in a secret vault. Tiber Septim was the only one outside of the organization to know it existed. After centuries the Acquisitioners have slowly begun to die out because of their almost non-existent recruitment, leaving only 9 members left in the time of skyrim. It's the duty of an Acquisitioner to do whatever possible to acquire an artifact even if they must sacrifice something or someone to do so; because if they don't then all of Nirn may be put into danger.

I rped this and it was mighty fun. I played as one of the 9 who was sent to skyrim to acquire the dragon masks before something happened, but I was captured crossing the border. When alduin attacked, I took it as my responsibility to stop him and to capture all of the dragon masks before it was too late because that is the duty of the Acquisitioners. This also justified doing some bad things to make sure the deadric artifacts didn't fall into the wrong hands.

I'm still writing the lore of the Acquisitioners and when I'm done I hope to make some mods to add them into the game.

I took some leeway with lore and created a organization like the blades, which I called the Acquisitioners. They were secretly established by Tiber Septim to acquire any dangerous artifacts, deadric or otherwise, and then store them away from the world in a secret vault. Tiber Septim was the only one outside of the organization to know it existed. After centuries the Acquisitioners have slowly begun to die out because of their almost non-existent recruitment, leaving only 9 members left in the time of skyrim. It's the duty of an Acquisitioner to do whatever possible to acquire an artifact even if they must sacrifice something or someone to do so; because if they don't then all of Nirn may be put into danger.

I rped this and it was mighty fun. I played as one of the 9 who was sent to skyrim to acquire the dragon masks before something happened, but I was captured crossing the border. When alduin attacked, I took it as my responsibility to stop him and to capture all of the dragon masks before it was too late because that is the duty of the Acquisitioners. This also justified doing some bad things to make sure the deadric artifacts didn't fall into the wrong hands.

I'm still writing the lore of the Acquisitioners and when I'm done I hope to make some mods to add them into the game.

This works for several IMO. Boethia's sacrifice as long as you find someone 'evil'. Only Namira is truly evil only. Molag Bal and Vaermina you can claim demonic possession.

Wow, never knew making people not become PALADINS OF SUPER ULTIMATE JUSTICE would cause such a position. Do any of you people complaining about being forced to be evil here ever play a game where there are no good options.

You don't have to complete all of the achievements on one character if it doesn't fit how you think they would act. On the other hand, if you are just trying to complete the achievements and RP be damned, then you don't need an answer to the question.

If you want to know why a 'good' person would do 'evil' things though, I would point to all through human history when people have convinced themselves that doing terrible things was okay because it was 'for the greater good' or some such. Also, Daedra lie. They are masters of manipulation when it comes to mortals. The Aedra too, but they are generally nicer about these things. Some of the Daedra princes take a great deal of joy out of leading a supposedly good person down a dark path, doing progressively more evil things while convincing themselves they are doing good, or the bad things were unavoidable or some other self-deceiving lie so they can sleep at night. Mortals are masters when it comes to justifying what they do.

The only problem with placing the artifacts in a vault is that the artifacts will return to Oblivion anyway. There's really nothing that can be done to stop an artifact from returning to Oblivion (Except what was done to turn Azura's Star into the Black Star).

That was only temporary ... Azura says. (You may, of course, choose to disbelieve her.) You were called in to speed up the process which would otherwise have taken a very long time.
Second, that is simply not true. H. Mora's artifact was hidden away and it took considerable effort to retrieve. If nothing else, you kept them safe (or the world safe from them) for a period of time more or less extended.

Ignore the achievement. Achievements adds nothing to the game. You probably mean Namira, not Vaermina.
In Vaermina quest you play the good guy (or the stupid one if you side with the daedra and kill the very useful follower just to get a daedric gizmo)
Daedra are evil. Except Meridia there is no reason for a good characer to do anything for them

I could be wrong, but I believe you can destroy the Skull of Corruption and it still counts towards that achievement.

I don't think so, because the achievement is to actually obtain the artifacts, not complete the quests.

My character did the Ebony blade quest if only to keep the Daedra from further corrupting Jarl Balgruuf's son. Her rationale was that it was better that she accept the consequences of what may follow than have a little boy who doesn't know any better come to harm. Same with Molag Bal. She took on that quest thinking it would stop the haunting of that house and keep some other schmuck getting trapped in there. Also, who cares about Boethiah's followers. I didn't find Malacath's quest to be particularly evil. But my mostly good character could not find a rationale to do either Boethiah's or Namira's quest. I just couldn't bring myself to kill that priest of Arkay, so Eola lost her head and I never showed up to dinner. =/

My character did the Ebony blade quest if only to keep the Daedra from further corrupting Jarl Balgruuf's son. Her rationale was that it was better that she accept the consequences of what may follow than have a little boy who doesn't know any better come to harm.