Complete an operation in co-op.

Do the same test twice

Master the Propulsion Gel

Discover the missing experiment

Earn 5,000 Player Points (PP).

Stand in a defective turret detector

Place in the top 50% of players in the online scoreboard for a Story level

Used the Brutal Melee move against another player

Revived a friendly player for the first time

Reach level 10.

Kill the Skeleton King in Normal mode.

Equip a legendary (orange) item.

Create a combo weapon