Here is the full list of all 7 Dash And Slash achievements.
Defeat the final boss and beat the game
Find both easter eggs (without closing the game) by clicking on random parts of the start menu
Die once
Die a lot more than once
Die a lot more than a lot more than once
Complete each level fast enough to earn all three trophies in every one of them
Beat the entire game without dying and without ever having invincibility enabled