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