Find a Health upgrade.
Have 3 Ammo packs in your inventory.
Find a Key.
Find a [V]ulcan and a [3]-Way Gun.
Find a [F]lamethrower and Hand Grenades.
Find a [P]ower upgrade and a [H]eavy Gun.
Have both mercenaries with full maxed life bars.
Have 8 Medic Kits in your inventory.
Complete Stage 1.
Complete Stage 2.
Complete Stage 3.
Complete Stage 4.
Enter all rooms in Stage 1. [Challenge icon = Boss warning]
Enter all rooms in Stage 2. [Challenge icon = Boss warning]
Enter all rooms in Stage 3. [Challenge icon = Boss warning]
Enter all rooms in Stage 4. [Challenge icon = Boss warning]
Defeat the boss in Stage 1 without taking damage.
Defeat the boss in Stage 2 without taking damage.
Defeat the boss in Stage 3 without taking damage.
Defeat the 1st boss in Stage 4 without taking damage.
Defeat the 2nd boss in Stage 4 without taking damage.
Beat the entire game playing only as Masato Kanzaki. Take no more than 22 minutes and 30 hits.
Beat the entire game playing only as Mizuki Makimura. No Health upgrades. [Starting room is safe to swap characters]
In the cavern with sliding sands guarded by bats, reach for the ceiling twice for each of its original dwellers.
Pick up the shiniest object in the fortress and stand on its location for a few seconds.