Beat Floor 1-1 on Normal or harder.
Beat Floor 1-2 on Normal or harder.
Beat Floor 1-3
Beat Floor 2-1 on Normal or harder.
Beat Floor 2-2 on Normal or harder.
Beat Floor 2-3 on Normal or harder.
Beat Floor 2-4
Beat Floor 3-1 on Normal or harder.
Beat Floor 3-2 on Normal or harder.
Beat Floor 3-3 on Normal or harder.
Beat Floor 3-4
Beat Floor 4-1 on Normal or harder.
Beat Floor 4-2 on Normal or harder.
Beat Floor 4-3 on Normal or harder.
Beat Floor 4-4 on Normal or harder.
Beat Floor 4-5
Beat Floor 5-1 on Normal or harder.
Beat Floor 5-2 on Normal or harder.
Beat Floor 5-3 on Normal or harder.
Beat Floor 5-4 on Normal or harder.
Beat Floor 5-5 on Normal or harder.
Beat Floor 5-6
Beat Floor 6-1 on Normal or harder.
Beat Floor 6-2 on Normal or harder.
Beat Floor 6-3 on Normal or harder.
Beat Floor 6-4 on Normal or harder.
Beat Floor 6-5 on Normal or Hard
Beat Floor 6-6
Accumulate 9 Lives!
Your first secret passage!
Take a Machine Gun!
Take a Chain Gun!
Kill Hans Grosse!
Get a Flamethrower!
Get a Rocket Launcher!
Get a Backpack!
Kill Hans Grosse with Pistol on Normal or harder!
Get a Second Backpack!
Beat Floor 6-6 Using Chaingun, with 2 Backpacks and 9 Lives on Normal or Hard!
Beat all levels of Mission 1 on Hard difficulty.
Beat all levels of Mission 2 on Hard difficulty.
Beat all levels of Mission 3 on Hard difficulty via the non-secret floor route.
Beat all levels of Mission 4 on Hard difficulty.
Beat all levels of Mission 5 on Hard difficulty.
Beat all levels of Mission 6 on Hard difficulty.
Find all secret passages in Mission 2 Floor 3.
Find all secret passages in Mission 3 Floor 3.
Find all secret passages in Mission 4 Floor 3.
Find all secret passages in Mission 5 Floor 6.
Find all secret passages in Mission 6 Floor 6.