Buy all Weapons, Tattoos, Masks and Outfits
Continue playing to unlock this secret achievement.
200 targets killed in double Overkill
200 targets killed in single Overkill (Triggered by your partner)
Perform 100 melee kills
Buy All Outfits
Complete the game on Insane
Level up to Rank 25
100 targets killed using either an MMG or an MGL
Buy All Guns
200 targets killed in single Overkill (Triggered by you)
Destroyed 500 objects
500 targets killed while in cover
You took the Aggro for 100 Flank kills
Level up to Rank 15
Perform 100 Headshots
Perform 250 Flank, Surprise and/or Tag Team kills
You didn't go wounded once in a mission (medium, hard or insane)
Fully customize a weapon with 6 customizable parts or more
Perform a x10 Co-op Combo
Perform a melee kill while you're in Overkill
Level up to Rank 5
Complete a mission (excluding New Blood) with a human partner
Perform 10 cover to cover transition in a row