Found out you have to do all of them with the same character to get the achievement.
Figured this might save some people a headache.
I started a brand new character and did the challenges in this order.
Be more objective 1,2 and 3. The hack on 2* I think is the hardest part of getting this achievement.
Spend points. I got battle hardened, intuition, faster supply recharge and sprinting reload.
Then I did Escort duty 1 and 2. Now I sold all of my points to drop a level so I could stay rank 1.
Escort 3 was next.
Now go to tower defense. I did the first 2 and made it back to rank 2. Said to hell with it bought my turret.
The turret worked well as a 'nade sponge. Keeping them off of me. Was actually easier than I thought. Lost the CP
once and got it back with 1 sec. left!
Parkour this was easy as a rank 2. Not sure this one gets any harder actually.
So good luck everyone on these challenges!
