Here is the full list of all 10 Dissolved - there are Chapter One achievements.
Reach the classroom
Reach the bar
Finish the game
Carry 12 corpses or more over your head in The Freak Out
Follow the teacher for 10 consecutive seconds or more
Finish The Hangover without throwing up
Reach an impressive score in any infinite mode
Defeat Dark Padla by a single burst in The Revenge
Find all the hidden messages
Quit the game without playing