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