Here is the full list of all 13 johns.game achievements.
You Discovered IJ^0
You're a bastard
"The Light at the end of the tunnel"
Kill 15 Cows. (Nothing that Christianity cant fix)
Claim Paleta for your own!
Kill the Mercenarys a Camp Charlie
Don't be mute
Meet Mr. Tree
Lead Paleta to a new Light
Achieve 100% Fame in Paleta
NEW_ACHIEVEMENT_DESC_1_15
Save IJ^0 from death
Not to mistaken with the God