Here is the full list of all 23 STRAYLIGHT achievements.
Complete the tutorial
Get a collector cube
Get every collector cube in one playthrough of a level
Get all of the collector cubes
Land on a Sticky Star
Collide with a monument
Reach max velocity
Complete a level in Zen Mode
Complete every level in Zen Mode
Complete a level in 25 grapples or less
Beat any level in under 60 seconds
Get from level 1 to the credits in under 2 hours
Get from level 1 to the credits in under an hour
Reach the credits
Complete the level "The End"
Complete a hard mode level
Complete all hard mode levels
Complete a level without dying
Complete levels 1-11 without dying
Die or reset 100 times
Die or reset 500 times
Beat the gold ghost to the exit portal in any level
Unlock all achievements