Here is the full list of all 15 Trulon: The Shadow Engine achievements worth 1,000 gamerscore.
Collect all the hidden treasures.
Visit Dad before leaving to Maelon
Slay Hunter in the Dark.
Complete the A Job to Kill for quest.
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
Win a battle using only Wildcards
Win a battle without taking any damage
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