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