Unbloodied Hands Achievement
Complete a mission without directly killing anyone yourself
You may want to learn the controls, and get used to the way the game plays first. You can earn this achievement while playing through the first mission . Hold down the :rb: to order your team mates to suppress, and have them assault the enemies. Work your way up to the helicopter extraction point, and once you extract from the level the achievement will unlock.
You can use artillery strikes with jeopardizing this achievement. You can also shoot at soldiers as long as you don't kill them. If you make a mistake and kill someone, just die, and restart from the previous checkpoint. This will allow you to carry on and earn the achievement.