Fury Unleashed

For this achievement you will need to complete all of the standard modes (Easy to Legendary) and also the two bonus modes (Necrodancer and Superhot).

Note: for the bonus modes, you just need to complete the three main comic books separately (there's no final ink book). I'll try to give some tips for these modes.

Necrodancer

I really struggled with this one because of the awkard rhythm timing (sometimes it felt like the game did not really follow the beat, and I found myself shooting but not shooting - leading to miserable ends). My main advice is to skip most of the rooms by popping in, checking if there are question marks to get some armor or upgrade and just leave (either by running or by Fast Travel). Forget about the combo, you lose it too easily. And forget also about gold, because you don't have many chances of buying things. Just cross your fingers and:
- Hope to get the Map Reveal upgrade
- Hope to get easy bosses (or bosses you can manage to beat); my choice for the final third comic book boss was Destroyer Of Cities, in my opinion the easiest of the bunch by far.

Superhot

If you stand still (and not shoot) time will go very slowly; that's why the key to this mode is patience. Try to upgrade as much as you can and build up your combo to gain some shields, but do not engage in messy battles: there's no need to explore every nook and cranny, your aim should be to be powerful enough to reach the end and kill the final boss. The Map Reveal upgrade helps a ton, of course.

Good luck!