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.
Escape the Rhombus
Save Loboto
Rescue Coach
Play the song melody on the keyboard in the Cruise Ship
Rescue Sasha
Create the spiked leather jacket on the UFO
Solve the sliding box puzzle on the Train in 20 moves or less
Rescue Lili
Rescue Milla
Listen to all of the radio stations on the Bus
Locate the Rhombus of Ruin
Help Coach out... with fire