Full list of all 19 Octahedron achievements worth 1,000 gamerscore. It takes around 15-20 hours to unlock all of the achievements on Xbox One.
Begin your journey
Beat World 1
Beat World 2
Beat World 3
Beat World 4
Beat World 5
Finish the game
Collect all tetrahedrons
Get all optional upgrades
Get all 100% Medals
Get all Deus Medals
Get all Par Any% Medals
Get all Par 100% Medals
Beat 5-T and collect all of its tetrahedrons
Beat 3-1, destroy no light bulbs or enemies, collect nothing
Beat X2-2 while touching the ground just once
Beat X4-1 while touching the ground just once
Beat X4-4 using only the basic platform
Beat World 1 in Rogue Extra mode