Here is the full list of all 25 Spirits of Xanadu achievements.
Fly the Xanadu back to Earth
Destroy every cleaner bot
Get killed by the environment
Obtain every weapon
Find and read "The Unusual Death of Governor Li"
Experience an attack of flatulence
Get drunk
Read every e-mail
Eat every donut
Put every toilet seat up
Get killed by the suicide droid
Smoke yourself to death
Boil away all the water and burn the toast
Become king of the zombies
Score a basketball goal
Obtain every page
Obtain every audiolog
Unlock the bonus mini-games
Destroy a robot with the showers
Beat the game without dying
Beat the game in 10 minutes or less
Scan the Xanadu with the Survey Bot
Destroy 3 bots in 2 seconds or less
Fly the Xanadu into a star
Stay aboard the Xanadu