I'v been playing brink for a bit and finally got started on the challanges, the par'kor one was fun and extreamly easy compaired to the others.
My question is this, "Has anyone actually gotten all of the challanges done with a rating of 3 stars?"
My only "beef" is that the computers are redicilious! (As in so crazy I am unsure on how to spell it). Its just crazy hard, as Im sure you all noticed.......

I completed the Be More Objective 2 star and I am now stuck on #3 star rating........... its not going well. It takes 3 things, knowing witch paths to take, how fast you get there, and luck, lots and lots of luck.

Here are a few little tips that came across when struggling to do it.
1: *Might not work the first few times but keep trying*, when the match starts run like hell to the bomb placement and set it up, when your finished, and survived if lucky, dont run back. Literally right next to the bomb placement there is a little crevis that you can place yourself in. When there you can shoot through the rusted metal and fence that the bomb is on, that gives you a clear shot at any computer that tries to remove the bomb, and dont worry because the blast from the explotion wont knock you down either.

2: When the bomb explodes changed to engeiner, now remember that little crevis that you hid in when watching the bomb? That can then be climbed straight up to the repair objective, Once you get there repair like crazy, if your fast enough you can get through it without having any enemies coming up the stars. (This is still if you manage to live.......if not this path is still alot safer and quicker and helps prevent you from getting shot alot sooner). *is sooner a word???? anyway....

3: The hack objective is the part that you need the most luck......I really cant explain how i got past it.....but once that is cleared its a straight shot to the carry objective.
If you manage to pull off the first 2 main objectives first you save yourselfe at east 2min. If you find yourself stuck, take your time with killing the enemies, and wait for an opening.

Other than that feel free to discuss any other stratigies that you may have come across, And Im always playing so feel free to look me up. My GT is the same as my Username.

"Damn those challanges.........lol"

I have all 4 done on 3star.

Parkour one was easy as hell, I fell off everything and still beat it.
Be more objective is somewhat hard, you just need to bum rush the objectives since the bots won't give you support anyway. Just shoot the dudes guarding the spots.
Escort duty: go heavy engineer and use a damage enhanced maximus mg.
Tower defense: see escort duty.

Maybe I was just extremely lucky but I didn't find them that challenging to be honest.

Escort Mission: The NPCs will bum rush at the exact moment you cross that invisible line and stop spawning once you cross another invisible line. They're predictable in their attacks so just remember when and where and you're good.

Tower of Power: Heavy Engineer with a Gatling Gun fixes everything.