Here is the full list of all 35 Planet of the Apes: Last Frontier achievements.
Best of all outcomes
Mark demonstrates his feelings for Jess
Bryn shows no mercy
Jess looks a gift horse in the mouth
Thaw relationship with Mark
Jess and Bryn sitting in a tree
An explosive ending
Maria accepts her fate
A debt repaid
Bryn is a family man
Bryn opens the way to peace
Complete Chapter 4
A chilling ending
Bryn makes an important choice
Bryn demonstrates brotherly love
Complete Chapter 3
A rather pointed decision
Jess does what's necessary
Set an ape on fire
Bryn shows wisdom
Complete Chapter 2
Bryn covers up a mistake
Complete Chapter 1
Complete Prologue
Where have all the good guys gone?
Jess betrays confidences
Jess puts her life on the line
Apes together strong!
Damn dirty apes
Bryn is his father's son
Juno's downfall
Bryn shows his true colours
Bryn prefers deeds to words
Jess puts the big man in charge
Jess does the right thing