Warhammer 40,000: Mechanicus

Easy enough, the game won't actually tell you about canticles in the tutorial; they're powerful abilities you can use once per mission, you use the d-pad to select them, and at the outset of the campaign you have only one, a healing ability, which actually doesn't heal all that much (5 pts or 50% of starter health for your tech-priests). The first mission after the tutorial (which doesn't count towards the achievement) can be fairly easily beaten without using canticles, and (at least on normal difficulty) you can go back to saves as much as you like to get through the battle if you're having trouble losing your tech-priests. Also note that your servitors are essentially expendable as they don't level up, losing them doesn't seem to hurt your mission rewards, and you get new ones regardless of how many you lose, so if you're having trouble surviving to the end of the mission, throw a servitor or two in to serve as a bullet sponge while your tech priests do the killing. Anyway, once the combat encounter is over, the achievement should pop during the results screen.