Here is the full list of all 12 Comix Zone achievements worth 200 gamerscore. It takes around 2-3 hours to unlock all of the achievements on Xbox 360.
You finished the first page.
You used a paper airplane.
You collected Roadkill.
You restored your health with Iced Tea.
You used the dynamite.
Rescue Alissa and complete the game.
Receive both endings.
Score 50,000 points.
Score 30,000 points.
Complete Episode 3.
Complete Episode 2.
Score 10,000 points.