Here is the full list of all 40 Leap of Faith achievements.
Comment on every nuke you can
End up with Kira
End up with Robin
End up with Stephanie
End up with Cece
End up with Holly
Stick to one girl all through the story
End up with Linda
Well, that was unexpected
End up with Kira and Robin
Play through the game once
See a minimum of 20,000 screens in Leap of Faith
End up with Lexi
Lie at least three times during one playthrough
Collect at least 30 images on your phone
Complete every task on your phone
Successfully sneak up on Steph
Achieve a perfect score when helping Cece remember
Leave Steph behind
Reach full speed at the bowling alley
Sleep with 5 different girls in one playthrough.
Unlock every dialogue option when sunbathing with Holly
Try, but fail setting Chris up with someone
Aquire 5 atletic trait points
Flex at every opportunity
Have a threesome
Aquire 5 romantic trait points
Don't lie at all during a full playthrough
Don't set Chris up with someone
Set Chris up with someone
Find Robin's pin-code
Show great expertise as a rear end identifyer
Reach max points with at least 5 people in your contact list
Nuke something
Unlock the party on the plane
Aquire 5 flirty trait points
Find three easter eggs
Get a hold on Lexi's number on your own
Jump out the window at Steph's place
Message Steph before you meet up with her again