Here is the full list of all 15 Trulon: The Shadow Engine achievements worth 1,000 gamerscore.
Completed the A Job to Kill for quest.
Won a battle using only Wildcards
Won a battle without taking any damage
Collect all the hidden treasures.
Visit Dad before leaving to Maelon
Slay Hunter in the Dark.
Complete the Game
Deal over 2000 damage with one attack
Use Below the Belt on a stunned opponent
Finish a battle with Retribution
Complete the game in less than 5 hours
Listen to all the advice from Marcus
Hit the level cap with a character
Defeat all the enemies in a single round
Collect all the tactics from random battles