Complete Stage 1 on Easy or higher
Complete Stage 2 on Easy or higher
Complete Inner Sanctum on Easy or higher
Complete Stage 1 on Medium or higher
Complete Stage 2 on Medium or higher
Complete Inner Sanctum on Medium or higher
Complete Stage 1 on Hard
Complete Stage 2 on Hard
Complete Inner Sanctum on Hard
Collect all Tech Points in Valley of Doom
Collect all Journals in Valley of Doom
Collect all Tech Points in Science Lab
Kill all Watcher Scientists in Science Lab
Collect all Tech Points in Inner Sanctum
Destroy all Watcher Incubators in Inner Sanctum
Complete the game without losing a life on Medium or higher
Complete Valley of Doom on Hard without losing a life
Complete Science Lab on Hard without losing a life
Complete Inner Sanctum on Hard without losing a life
Get the 1-up in Stage 1
Get both 1-ups in Stage 2
Get all three 1-ups in Stage 3