Full list of all 12 Psychonauts in the Rhombus of Ruin achievements. It takes around 2-3 hours to unlock all of the achievements on Windows.
Rescue Sasha
Solve the sliding box puzzle on the Train in 20 moves or less
Rescue Lili
Rescue Milla
Locate the Rhombus of Ruin
Rescue Coach
Save Loboto
Escape the Rhombus
Help Coach out... with fire
Play the song melody on the keyboard in the Cruise Ship
Create the spiked leather jacket on the UFO
Listen to all of the radio stations on the Bus