Heal yourself with a medkit 100 times.

Finish 75 quests cumulatively.

Kill 5 Infected in a row with a single blow.

Kill 10 zombies in a row with headshots.

Kill 250 zombies using edged melee weapons.

Complete a level using only the flamethrower. Melee, grenades & explosives are OK.

Shoot at or be shot by an ally with a Pack-a-Punch crossbow and kill six zombies with the explosion.

In Shangri-La, acquire the focusing stone.

In Moon, purchase every perk in one game.

In Die Rise, be the architect of their instruction.

In Die Rise, revive yourself.

In Die Rise, reach round 10 before turning on the power.