Complete Liberation.

Save 5 allies by throwing away a live enemy grenade.

Get ending 1.

Complete the game on Normal.

Complete S.O.E.

Complete Operation Cobra.

Escape from the ship.

Escape from the Baker family home.

Uncover the secret in the old house.

Fight off Marguerite while she wanders the old house to make her run away.

Increase your item slots.

Use psychostimulants.

Stab an injured crawling enemy.