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