Octahedron achievements

In 2-5: Block 5 projectiles using your platforms, without touching the ground

Beat 3-8, destroy no light bulbs or enemies, collect nothing

Get all Par 100% Medals

Beat 4-7, collect and destroy nothing, don't get detected by a scanner, don't get hit

Collect all tetrahedrons

Get all Time Medals

Beat 1-6, collect and destroy nothing, don't get detected by a scanner, don't get hit

Beat the game in under 2 hours

After unlocking all optional upgrades, revisit 1-2 to get a Par Any% and a Par 100% Medal at the same time