Finish Mission 1 by going through the upper path.
Finish Mission 1 by going through the lower path.
Finish Mission 2.
Finish Mission 3 by going through the lower path.
Finish Mission 3 by going through the upper path.
Finish Mission 4 by going through the upper path.
Finish Mission 4 by going through the lower path.
Finish Arcade Game on Easy Mode (Level-4 difficulty).
Finish Arcade Game on Hard Mode (Level-4 difficulty)
Finish Arcade Game as Marco (Level-4 difficulty).
Finish Arcade Game as Tarma (Level-4 difficulty).
Finish Arcade Game as Eri (Level-4 difficulty).
Finish Arcade Game as Fio (Level-4 difficulty).
Finish Arcade Game as Ralf (Level-4 difficulty).
Finish Arcade Game as Clark (Level-4 difficulty).
Finish Arcade Game without using a continue as Marco on Hard Mode (Level-4 difficulty, Hero 3).
Finish Arcade Game without using a continue as Tarma on Hard Mode (Level-4 difficulty, Hero 3).
Finish Arcade Game without using a continue as Eri on Hard Mode (Level-4 difficulty, Hero 3).
Finish Arcade Game without using a continue as Fio on Hard Mode (Level-4 difficulty, Hero 3).
Finish Arcade Game without using a continue as Ralf on Hard Mode (Level-4 difficulty, Hero 3).
Finish Arcade Game without using a continue as Clark on Hard Mode (Level-4 difficulty, Hero 3).
Finish Arcade Game without dying and not using vehicles, with bullet infinity enabled (Level-4 difficulty).
Finish Arcade Game within 28 minutes (Level-4 difficulty).
Finish Arcade Game using less than 10 continues on Hard Mode and Level-8 difficulty.
Finish Mission 1 with the SV-001 (Metal Slug) (Level-4 difficulty).
Finish Mission 3 with the Protogunner (Level-4 difficulty).
Finish Mission 4 with the Slug Flyer (Level-4 difficulty).
Finish Mission 5 with the SV-001 Type-R (Metal Slug) (Level-4 difficulty).
Reach 10 million score.
Recapture all 100 prisoners from the Soldiers List.
Collect all 41 items from the Trophy of War.
Collect 20 POWs on Mission 1 by going through the upper path.
Collect 20 POWs on Mission 1 by going through the lower path.
Collect 20 POWs on Mission 2.
Collect 20 POWs on Mission 3 by going through the upper path.
Collect 20 POWs on Mission 3 by going through the lower path.
Collect 20 POWs on Mission 4.
Collect 20 POWs on Mission 5.
Finish Mission 5 from Combat School.
Finish Mission 9 from Combat School.
Finish Mission 14 from Combat School.
Finish Mission 21 from Combat School.
Finish Mission 26 from Combat School.
Unlock the special ending image from the art gallery.
Unlock Lilly's ending image from the art gallery.
Unlock Mary's ending image from the art gallery.