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