Here is the full list of all 35 Planet of the Apes: Last Frontier achievements.
Apes together strong!
Mark demonstrates his feelings for Jess
Bryn opens the way to peace
Complete Chapter 4
Thaw relationship with Mark
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
Jess and Bryn sitting in a tree
Damn dirty apes
Bryn demonstrates brotherly love
Bryn is a family man
Juno's downfall
Bryn shows his true colours
Bryn prefers deeds to words
A debt repaid
An explosive ending
Jess looks a gift horse in the mouth
Maria accepts her fate
Jess puts the big man in charge
Jess does what's necessary
Bryn covers up a mistake
A chilling ending
Bryn makes an important choice
Bryn shows no mercy
A rather pointed decision