Ilum is one of dynamic encounter planets added with 7.7. It has 310 legacy points spread between 31 achievements in 4 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
These achievements are unlocked for completing the Imperial faction dynamic encounters on Ilum. The missions needed to complete these are;
Crushing Our Enemies | Deflecting Their Blows | Ensuring Our Victory | Foiling Their Ambushes | Lisk Frenzy | Surrounded
20 Legacy Points
This achievement is unlocked for completing four dynamic encounters five times each. The missions needed to complete this are;
Crushing Our Enemies | Deflecting Their Blows | Ensuring Our Victory | Foiling Their Ambushes
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 Republic faction dynamic encounters on Ilum. The missions needed to complete these are;
Blizzard Blitz | Clear the Crystals | Cold Called | Frozen Front | Shivering Stand | Troubled Tauns
20 Legacy Points
This achievement is unlocked for completing four dynamic encounters five times each. The missions needed to complete this are;
Blizzard Blitz | Cold Called | Frozen Front | Shivering Stand
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 shared dynamic encounters on Ilum. The missions needed to complete these are;
Enraged Wampa | Rampaging Guid | Road to Fort Tonvarr | Tauntaun Alpha | The Defense of Fort Tonvarr | The Fall of Fort Tonvarr
10 Legacy Points
This achievement is unlocked for interacting with the throne in the courtyard of Fort Tonvarr. This item needed to complete this is;
The Throne of Tonvarr
The mission needed to complete this is;
The Fall of Fort Tonvarr
20 Legacy Points
This achievement is unlocked for killing 30 player characters in the Eastern Ice Shelf where the Ensuring Our Victory and Frozen Front missions take place. Althuogh the achievement is likely supposed to only count kills that take place when the encounters are up it is also counting them when the missions are finished. This missions needed to complete this are;
Ensuring Our Victory | Frozen Front
10 Legacy Points
This achievement is unlocked for completing all Imperial dynamic encounters on Ilum. The achievements needed to complete this are;
Crushing Our Enemies | Deflecting Their Blows | Ensuring Our Victory | Foiling Their Ambushes | Lisk Frenzy | Surrounded
10 Legacy Points
This achievement is unlocked for completing all Republic dynamic encounters on Ilum. The achievements needed to complete this are;
Blizzard Blitz | Clear the Crystals | Cold Called | Frozen Front | Shivering Stand | Troubled Tauns
10 Legacy Points
This achievement is unlocked for completing all shared dynamic encounters on Ilum. The achievements needed to complete this are;
Enraged Wampa | Rampaging Guid | Road to Fort Tonvarr | Tauntaun Alpha | The Defense of Fort Tonvarr | The Fall of Fort Tonvarr
5 Legacy Points | 20 Legacy Points | 10 Legacy Points | 10 Legacy Points
These achievements are unlocked for completing any combination of 5, 15, 30, and 45 dynamic encounters on Ilum.
25 Legacy Points
This achievement is unlocked for completing all dynamic encounter region meta achievements on Ilum. The achievements needed to complete this are;
Ilum Dynamic Encounters: General | Ilum Dynamic Encounters: Imperial | Ilum Dynamic Encounters: Republic
50 Legacy Points | Grants Item: Ilum Leisure Cruiser on completion
This achievement is unlocked for completing all non-mastery dynamic encounter achievements on Ilum. The achievements needed to complete this are;
Encounter Completionist: Ilum | Pontite Hoarder