Complete Mission 1 with no continue

Complete Mission 2 with no continue

Complete Mission 3 with no continue

Complete Mission 4 with no continue

Complete Final Mission with no continue

Achieve over 3,000,000 points

Ride all the Slugs

Defeat any boss in the game with the METAL SLUG ATTACK

Reach the icy cave's exit with the Elephant Slug

Clear Mission 2 as a zombie

Play all the routes

Find and save Hyakutaro Ichimonji