Ord Mantell is one of dynamic encounter planets added with 7.7. There are a total of 125 legacy points spread between 14 achievements in 2 subsections. Most of these are relatively easy to unlock, depending on your luck with the random spawns of the missions.
5 Legacy Points | 5 Legacy Points | 5 Legacy Points | 5 Legacy Points
5 Legacy Points | 5 Legacy Points | 5 Legacy Points
These achievements are unlocked for completing the dynamic encounters on Ord Mantell. The missions needed to complete these are;
Driving the Point | Ethan Remak | Good Mantellian | Inside Job | Power Walking | Savrip Skullcaver | Separatist Field Commander
10 Legacy Points
This achievement is unlocked for using each droid once. You cannot use more than one droid for each mission, so this will need to be completed three times. The mission needed to complete this is;
Driving the Point
10 Legacy Points
This achievement is unlocked for using the important Looking Keycard on the Mainframe during the dynamic encounter. Selecting the keycard option on the mainframe will grant this achievement. The item needed to complete this is;
Important-Looking Keycard
The mission needed to complete this is;
Inside Job
5 Legacy Points | 5 Legacy Points | 5 Legacy Points
These achievements are unlocked for completing any combination of 5, 15, and 30 dynamic encounters on Ord Mantell.
10 Legacy Points
This achievement is unlocked for completing all dynamic encounters on Ord Mantell. The achievements needed to complete this are;
Driving the Point | Ethan Remak | Good Mantellian | Inside Job | Power Walking | Savrip Skullcaver | Separatist Field Commander
50 Legacy Points | Grants Item: Zylthan Foothill Clipper on completion
This achievement is unlocked for completing all non-mastery dynamic encounter achievements on Hoth. The achievements needed to complete this are;
Encounter Completionist: Ord Mantell | Republic Hero