Here is the full list of all 41 Contra: Operation Galuga achievements.
Stack a weapon to Level 2.
Overload a special weapon.
Overload each weapon type at least once.
Overload all weapons at least once.
Score enough points to earn an Extra Life.
Complete Arcade Mode.
Complete Arcade Mode without Perks equipped.
Complete Arcade Mode in 1-Hit Kill mode.
Complete Stage 1 in Story Mode.
Complete Stage 2 in Story Mode.
Complete Stage 3 in Story Mode.
Complete Stage 4 in Story Mode.
Complete Stage 5 in Story Mode.
Complete Stage 6 in Story Mode.
Complete Stage 7 in Story Mode.
Complete Stage 8 in Story Mode.
Discover Bradley's fate...
Defeat the Super Wall in Arcade Mode Stage 1 without dying.
Defeat the Mutant Lieutenant in Arcade Mode Stage 2 without dying.
Defeat Gromaides in Arcade Mode Stage 3 without dying.
Defeat the Alien Heart in Arcade Mode Stage 4 without dying.
Defeat the Devil Worm in Arcade Mode Stage 5 without dying.
Defeat Big Fuzz in Arcade Mode Stage 6 without dying.
Defeat Kimkoh in Arcade Mode Stage 7 without dying.
Defeat Dragon God Java in Arcade Mode Stage 8 without dying.
Defeat any boss in Arcade Mode without taking damage.
Purchase something from the Perk Shop.
Purchase an Alternate Soundtrack from the Perk Shop.
Purchase a Player Character from the Perk Shop.
Purchase everything from the Perk Shop.
Earn 350,000 points in a single playthrough.
Earn 40,000 Contra Coins overall.
Complete the game faster than 59:59.
Complete a Challenge in Challenge Mode.
Complete 10 Challenges in Challenge Mode.
Complete 20 Challenges in Challenge Mode.
Steal a life from another player in Multiplayer.
Have a life stolen in Multiplayer.
Defeat 10,000 enemies total.
Defeat 20,000 enemies total.
Input the Konami Code. You know the drill.