Here is the full list of all 35 Planet of the Apes: Last Frontier achievements worth 1,000 gamerscore.
Jess sided with Willits
Humans won
The worst of all endings
Jess condoned beating of Clarence
Apes won
Jess sacrificed herself
Maria died with dignity
Bryn killed Tola with his bare hands
Mark died
Jess didn't trust Apehunters
Juno died despised by everyone
Jess killed ape with spear
Clarence was talking to a brick wall
Khan died disappointed
Peaceful ending
Many characters saw peace happening
Rainey is a leader
Mark put trust in his mother
Jess blew up the tracks
Juno saved Bryn's life
Bryn proved his love
Bryn released Maria
Chapter 4 Completed
Mark was on the verge of death
Brutus did not make it
Juno is safe and loved
Jess protected Clarence
Chapter 3 Completed
Ape was set on fire
Bryn listened to Clarence
Chapter 2 Completed
Bryn earned his father's respect
Bryn lied to Khan
Chapter 1 Completed
Prologue Completed