Completed the first level.

Healed back to full from 1 HP.

Pick up 10,000 coins.

Purchase a female character.

Purchase a new character.

Purchase a new weapon.

Own all of the characters.

Own all of the weapons.

Learned to back-strafe.

Fire more than 10,000 bullets.

Beat the game without dying.

Purchase a coin-pack.

Beat a level without killing an enemy.

Die 15 times on one level.

Collect all stars and skulls in the game.

Own every item and upgrade them to max.