Here is the full list of all 18 Wait! Life is beautiful! achievements.
Period
Lose 35 people
Save a girl from being dragged down to hell by her father
Lose 20 people
"Talk" to your mom on the phone
Lose 13 people
Join the Cult
Save five people
Lose five people
Beat Electronica
Screw work
There goes the bridge...
Listen to all of Rae's stories
Listen to all of Ethan's stories
Save 20 people
Save 12 people
Save 35 people