Monsters of Makeb map | What's new in RotHC? SW: TOR - Rise of the Hutt Cartel Guide

Map with markings of enemies needed for Monsters of Makeb achievement

Keep in mind, that you should look for a decent group, or at least skilled friend if you want to kill all mobs for Monsters of Makeb achievement. While you can solo some of enemies needed for achievement, you will also find some of tchem extremally difficult even for good two-player group. If you will decide to challenge them try doing this at least with tank and a healer, both with decently geared companions.