See Billy for the first time

Destroy the enemy gunslinger

Destroy the kamikaze enemy

Get an upgrade

Die in the fire

Use the weapon for the first time

Use robotic arms for the first time

Use the rocket boot for the first time

Use the air booster for the first time

Use an access card

Go through a laser

Destroy an enemy with bazooka

Face the final boss

Beat the final boss

Complete all achievements