Complete second level

Complete fourth level

Complete sixth level

Complete seventh level

Kill 20 enemies

Kill 50 enemies

Kill 150 enemies

Kill 250 enemies

Kill 400 enemies

Unlock all weapons

Unlock all perks

Start the game without purchasing

Use a grenade

Use the grenade 10 times

Use the grenade 25 times

To die for the first time

Pick up the first aid kit 10 times

Pick up ammo 10 times