Get to the Spaghetti save point in Snowdin.

Reach the mouse hole in the Ruins.

Get three items.

Collect all of Deliver Us The Moon's trophies

Find the rhythm to a source of overwhelming power

Witness all holograms

They all float down there

Complete seven astrotool dossier profiles

One small step for man, one giant leap for mankind

Take a seat outside to admire the view

Find oxygen when death seemed certain

Reach the Taurus V with only seconds to go

Stir a sleeping giant, save the world and reunite with an old friend