Unlock the Tesla Rifle
Beat game once & save.
Reload game save & find room key 502. It is north of the hospital, up the long flight of stair's. Play through the game until you are at the Motel level.
Now use the key to open the door you could not open before and you will get the UFO ending.
Save your game…
Atlas is an action-rpg with rogue-like elements where you use your ability to control the ground to fight the enemies and move through procedurally generated worlds.
