Here is the full list of all 10 Spectrubes Infinity achievements.
Beat the downloaded level set from Steam Workshop (not yours)
Make 500 steps in any level (besides custom)
Download content from Steam Workshop
Publish content into Steam Workshop
Test a level in the level editor
Begin the game
Begin the level 30
Beat the game
Place all cubes in paths within one level (excluding custom)
Drop all trapdoors in level 50