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
Complete every task on your phone
Aquire 5 romantic trait points
Reach full speed at the bowling alley
Don't lie at all during a full playthrough
Try, but fail setting Chris up with someone
Have a threesome
Sleep with 5 different girls in one playthrough.
Collect at least 30 images on your phone
Unlock every dialogue option when sunbathing with Holly
Find Robin's pin-code
Set Chris up with someone
Show great expertise as a rear end identifyer
Leave Steph behind
Comment on every nuke you can
Unlock the party on the plane
Find three easter eggs
Jump out the window at Steph's place
Message Steph before you meet up with her again
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
Stick to one girl all through the story
Successfully sneak up on Steph
Flex at every opportunity
Lie at least three times during one playthrough
Don't set Chris up with someone
Achieve a perfect score when helping Cece remember
Aquire 5 flirty trait points
Aquire 5 atletic trait points
Well, that was unexpected