Kill your first zombie.

Kill 100 zombies in one run.

Kill 300 zombies in one run.

Kill 600 zombies in one run.

Defeat your first boss.

Defeat the Tentacle Boss 5 times.

Defeat the Slender Boss 5 times.

Choose the Winter Cold event.

Choose the Scorching Heat event.

Use Panic Bullet 25 times.

Use Electro Bullet 50 times.

Pick up a medkit while under 50 HP, 25 times.

Pick up shield armor 25 times.

Pick up 100 power-ups in one run.

Use Mushroom Bullet 25 times.

Make 100 zombies fight for you with Mushroom Bullet.

Use Floor Trap 25 times.

Make 50 zombies fall through a floor trap.

Use Oil Bullet 25 times.

Make 100 zombies slip on oil.

Use Ghost Bullet 25 times.

Hit 100 zombies with Ghost Bullet.

Use Time Stop 25 times.

Kill 50 zombies while Time Stop is active.

Pick up 25 permanent upgrades in total.

Pick up 10 reload speed upgrades.

Pick up 10 bullet damage upgrades.

Pick up 10 bullet speed upgrades.

Defeat 10 bosses total.

Survive 10 minutes in one run.