Defeat the tier 1 boss

Escape the tier 1 level

Escape the tier 2 level

Escape the tier 3 level

Herd a sheep to the trapdoor

Herd five sheep to the trapdoor in a single run

Upgrade any projectile weapon to have 10+ number of projectiles

Purchase an item from the shop

Kill a frozen enemy

Kill 5 enemies with a single battery explosion