First enemy killed

First level completed

First boss completed

First weapon unlocked

100 enemies killed

Second day completed

1000 enemies killed

One hour in slowmotion

Completed a level on first try

Completed a level without slowmotion

Complete first day without dying on medium difficulty

10 000 enemies killed

Complete the first and second day without dying on medium difficulty

All challenges completed on medium difficulty

All weapons and upgrades unlocked on medium difficulty

Game completed on medium difficulty