Here is the full list of all 49 Kyn achievements.
New powers
Completed Mission 1
Justice?
*HIC*
Friend or Foe?
Completed Mission 2
Mmmmm meat
A light in the Darkness
Completed Mission 3
Completed Mission 4
Break the Siege
A bridge to far
Completed Mission 5
Hot, Bright and Shiny
Genius or Madness?
Completed Mission 6
Is that you, mother?
Completed Mission 7
Free at last
I am the Law!!
Completed Mission 8
Completed Mission 9
Completed Mission 10
Completed Mission 11
Yaaarr!
Completed Mission 12
Completed Mission 13
Completed Mission 14
Reunited at Last
Completed Mission 15
An old man's best friend
Completed Mission 16
Completed Mission 17
Completed Mission 18
Complete Kyn on Casual difficulty
Complete Kyn on Normal difficulty
Complete Kyn on Hard difficulty
Complete Kyn on Brutal difficulty
Complete Kyn on Legendary difficulty
Ultimate stone collector
One of the sacred scrolls
A young apprentice
Who needs a bow?
True Iron
Completed al last!