Here is the full list of all 18 Mark After Dark achievements.
Poop your pants
Go for a spin
Get kicked in the junk
Anger an old woman
Find the feminine hygiene products
Have coffee dumped on your lap
Read a suggestive magazine
Get peed on by a dog
Make an embarrassing discovery
Get puked on
Fail at picking up a lady
Get married
Not quite the happy ending he wanted
Find Mark's waifu pillow
She spelled your name wrong
A magical combination
Eat all the food
Get 1000 points