No missable achievements (plus 8 unknown)
Sign in with Steam or Xbox to track your progress, and:
Retry 3 solved challenges and improve their results.
Run a self-constructed level with a successful level end.
Retry a solved challenge 10 times - each time.
Blow out a candle and enlighten it again, still air (Editor), 5x.
Download and solve 5 different Community levels.
Upload 5 different challenges.
Reach Genius level 25.
Solve all challenges with 3 stars.