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