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