Full list of all 16 Reed Remastered achievements worth 1,000 gamerscore. It takes around 0.5-1 hour to unlock all of the achievements on Xbox Series X|S.
Get your first cube
Die once
Get killed by a chicken
Meet the mouse
Find the first secret area
Find the second secret area
Find the third secret area
Find the fourth secret area
Complete 5 levels
Complete 15 levels
Complete 20 levels
Complete 25 levels
Complete 30 levels
Complete 35 levels
Complete 40 levels
Complete 44 levels