Heal yourself with a medkit 100 times.

Find 120 collectibles.

Customize 25 weapons.

Finish 75 quests cumulatively.

Kill an Infected with a grenade blast.

Use a large medkit to heal an injury of 5% or less.

Kill 250 zombies using edged melee weapons.

Kill 10 zombies in a row with headshots.

Use a hammer to kill a series of 15 zombies without taking damage.

Reach level 25.

Kill a Ram using tackle skill.

Kill 25 zombies with your bare fists.

Kill 250 zombies with modified weapons.