28. Any% and 100% Speedruns
You have a pretty large window for this achievement as you need to beat the game in under 3 hours for the any% achievement and under 4 hours for the 100% achievement. Now that the game is fresher in your mind, this should be much easier to accomplish. Just a few tips for this though as it's honestly not hard to do if you do this right after your first playthrough.
-Do this on HERO Mode as you'll have all of the initial dances right off the bat, meaning you can pick up collectables MUCH earlier than you normally would and also fly over most stages.
-Speaking of collecting items, collect any that you can as you progress through levels the first time to save you plenty of time on backtracking.
-Make sure before beating the game that you make a copy of your save so that you can go back and get all of the items that you missed so that you don't have to start all the way back from the beginning. That way you can net both achievements in the same playthrough.
-Gather all of the Gallery Keys as soon as you can. That way you can get the Magical Tiara and just breeze through the rest of the game with unlimited invincibility.
-Make use of the Warp Dance to skip areas to shave several minutes off your time!
Just play through the game for the first speed run, grabbing items the first time around when you can and you'll easily beat the game under 3 hours. REMEMBER TO MAKE A COPY OF YOUR SAVE BEFORE BEATING THE GAME.
Now after the achievement unlocks, open up the copy of your game and backtrack to get the rest of the items. Once you get everything else, beat the game as normal and you should finish under 4 hours for sure.
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