Jungle Hike
Complete Mission 1
Trek Through the Deep Jungle
Complete Mission 2
Ruins Raid
Complete Mission 3
From Beach to Mountain
Complete Mission 4
Sky and Fortress
Finish the Game
Tough Jungle Hike
Complete Mission 1 on Hard
Tough Trek Through the Trees
Complete Mission 2 on Hard
Risky Ruins Run
Complete Mission 3 on Hard
Brutal Beach and Mighty Mountain
Complete Mission 4 on Hard
Master Infiltrator
Finish the Game on Hard
Hardcore
Get Card 004 Paper Thin
HARDCORE MODE
Complete any mission with Card 004 Paper Thin turned on!
SEE YOU IN HELL
Defeat Allen Jr. and get his Card
Welcome To The Dungeon
Get access to the Dungeon
Tutor's Love
Get access to the hidden area in mission 1
There's Only One Metal Slug!
Kill Formor (first boss) fast!
Twin Towered!
Kill Emain macha (second boss) fast!
What's It's Name Again?
Kill Kaladgolg (third boss) fast!
Another Keesi Bites The Dust!
Kill The Keesi III (Fourth boss) fast!
That Ain't A God!
Kill Cabracan (Fifth boss) fast!
All Dead
Kill 999 Soldiers
All Prisoners Saved!
Save all 100 Prisoners!
100 Cards!
Collect 100 Cards!