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