Army of Two insane save +mop up save
1) just buy a gun attatchment to unlock all guns achievo and then buy the last outfit for the other two .will also be in legit order
Look at you! -(buy all outfits)
Deep pockets -( buy all mask -guns eta)
Armed to the teeth-(buy all guns)
2) just finish one chapter and all leveling up achievements will pop (5/15/25)
Sir, Yes sir!-( level up to rank 5 )
Keep it up !-( level up to rank 15)
Blood,sweat and guns - (level up to rank 25)
3)just finish one mission on insane (not just one chapter )
Look mom, i made it ! - Completeing game on insane
4)do one more backstab for 2 more achievements
Backstabbing bastard-(50 Back stabs)
Blood sport -(100 melee kills)
5) get one more kill in double overkill for 3 more achievements
overkiller- (200kills in overkill triggered by u)
moocher- (200 kills in overkill triggered by team mate )
double trouble - (200 kills in double overkill)