No missable achievements (plus 13 unknown)
Sign in with Steam or Xbox to track your progress, and:
You have died over 250 times and you haven't given up yet. I'm proud of you!
You've collected 40 stars in story mode. That's pretty good.
You scored 20,000 points in story mode. That's a good start.
You've managed to collect a total of 1000 coins. That's enough to fund a small space program. WINK WINK NUDGE NUDGE.
You've collected 80 stars in story mode. Well now, that is pretty great.
You beat story mode, congrats!
You scored 35,000 points in story mode, and have become the score CHAMPION!
You beat Gauntlet X. I...uhh...wow. That's a hard level.
You've collected 101 stars in story mode. That's it, you should have gotten all the things by now. You know I think you may even be better at this game than the guy who made it.
You beat arcade mode, well done!
You beat arcade mode, and did it in less than 2100 seconds. That is reeeeeeeeeeeeally fast.
You beat story mode, and managed to to die less than 25 times. That's impressive.
You beat arcade mode, and managed to rack up 40 lives. Wow jeez that's awesome!