Pass Zeroing.

Pass Grenade Throw.

Complete the Assault Course.

Pass Security Education.

Pass CPR Training.

Pass Grass Mowing.

Pass Lunch.

Get an S in Zeroing.

Get an S in Grenade Throw.

Get an S on the Assault Course.

Answer every Security Education question correctly.

Get an S in CPR Training.

Mow 100% of the grass.

Get an S in Lunch.

Pass all seven trainings.

Get an S in all seven trainings.

Defeat Ox-Head and Horse-Face in Hell.

Defeat the Sergeant Major.

Defeat the Wild Boar.

Defeat the Water Deer.

Defeat the Devil Water Deer.

Land the final blow on a boss with the M16.

Defeat a boss without firing a single bullet.

Defeat a boss without taking any damage.

Receive the M16.

Take a Panzerfaust.

Get hand grenades.

Finish the game.

Arrive in Hell.

Steal the armory keys from the admin office.

Lure a sentry with a pie made of chocolate.

Make Jjam-Tiger your companion.

Complete the Transport Officer's request.

Reach the highest alert level, DEFCON.

Fuel the Sherman tank and drive it.

Climb to the top of the main gate.

Get run over in the tunnel.