- there's a bunch of miscellaneous achievements like "kill 50 enemies using X attack" and "do this thing in this stage" these will all pop out naturaly by playing the game
- then you get an achievement for finishing all the stages on normal with an S rank,getting S isn't hard but it can take a while and there is an even better easy way to do it
- after finishing normal you get a special mode where you can't see your health bar
- finish the whole game under this mode to get another achievement popping out
- if you got at least 10 S you get a special mode where you take triple damage,finish the game under this mode (put it on easy because this actualy makes the game hard,playing it on easy with this mode is actualy harder than playing the game on hard with your normal health bar

) to make another achievement
- finishing the game with the triple damage mode unlock a mode where you have unlimited special bars,this makes getting S ranks piss easy so you can abuse this mode to...
- get S rank on all the stages on hard,you can also use this mode to get any S you missed on your first play of normal (or second if you use normal to finish the game under the "invisible health bar" mode) i guess if you are good at the game,you can try to cut a replay by playing invisible mode on hard,or playing your first run on hard and then invisible mode on normal
oh and before you ask,you get ranked on the following thing
- damage done
- time took to finish the stage
- number of QTE you didn't fuck up
QTE usualy give a fair warning so there aren't a lot of chance to fuck up,even if you fuck up most stage still give you an S even if you fuck up one or two QTE