That Old Classic
Enter the Konami Code on the title screen
Off to the Tropics
Clear Stage 1: Jungle
Commencing Infiltration
Clear Stage 2: Base #1
Salmon with a Spread Gun
Clear Stage 3: Waterfall
In Your Base, Killing Your Dudes
Clear Stage 4: Base #2
Siberian Warfare
Clear Stage 5: Snow Field
Wasting Energy
Clear Stage 6: Energy Zone
Minecart Mayhem
Clear Stage 7: Hangar
The Fall of Red Falcon
Clear Stage 8: Alien's Lair and beat the game
Private Peashooter
Beat the game without collecting any weapon powerups and without using the Konami Code
Consider Yourself a Hero!
Beat the game without using the Konami Code
Medals of Honor
Beat the game without dying more than twice and without using the Konami Code
Base #1 Challenge
Defeat the Stage 2 boss without damaging any turrets and without using the Konami Code
Energy Zone Cease-Fire
Reach the boss in Stage 6 without shooting and without using the Konami Code
Jungle Challenge
Beat Stage 1 without pressing left and without using the Konami Code
Base #2 Challenge
Enter and clear Stage 4 using only the Flame
Hangin' Around
Crouch on top of one of the spiked walls in Stage 7
Waterfall Challenge
Reach the Stage 3 boss without pressing up or down and without using the Konami Code
Snow Field Challenge
Collect every item in Stage 5 without dying
Hangar Challenge
Enter and clear Stage 7 using only the Laser
Die-pass Operation
Defeat the final boss without damaging the aliens or their spawners
Fried Commando
Get zapped by the barrier in Stages 2 or 4
Biggest Bounty
Score 750,000 points without using the Konami Code
Rookie Numbers
Beat the default high score of 20,000 points without using the Konami Code
Hydrophobia
Clear Stage 1 without falling into the water
Anti-Turretism I
Destroy every turret in Stage 2
You Ever Dance with the Giant?
Move around and avoid the Stage 6 boss without shooting
Oculus Drift
Defeat the Stage 2 boss without destroying any projectiles or turrets, and without using the Konami Code
Anti-Turretism II
Destroy every turret in Stage 4
Red Falcon's Revenge
Beat the game's second loop
Laser-Precise Lockpicking
Defeat the Stage 1 boss using the Laser without jumping or shooting diagonally
Walking Tall
Beat the game without crouching - only allowed in Stage 6 to drop through the platforms
Jungle Cease-Fire
Reach the boss in Stage 1 without shooting or dying
Waterfall Cease-Fire
Reach the boss in Stage 3 without shooting or dying, and without using the Konami Code
Energy Zone Challenge
Kill 10 Gunners in Stage 6 without damaging any other enemies and without using the Konami Code
I Have Arms, and I Must Scream
Defeat the Stage 3 boss without damaging its arms or jumping, and without using the Konami Code
Phantom Penance
Defeat the Stage 4 boss without destroying any of its projectiles or its turret
Unidentified Fighting Object
Let the Stage 5 boss teleport 7 times without destroying any of its projectiles
Enemy Behind the Gates
Defeat the Stage 7 boss while staying on the left edge of the screen and not destroying its mortars
Alien's Lair Challenge
Defeat the Stage 8 miniboss without shooting diagonally