These achievements are associated with the uprising Crimson Fang. There are 380 legacy points spread between 18 achievements in 4 subsections and 1 unobtainable achievement. All of the achievements can be completed in 3 runs of the uprising, one in each difficulty.
25 Legacy Points | 25 Legacy Points | 25 Legacy Points | 25 Legacy Points
These achievements are unlocked for defeating Jor "Oneshot" Mesok, Takkan Russco, KT-55 and PR-98, and Elarea Aldraste the Red Huntess each once in [MASTER] difficulty. The activity needed to complete these is;
[MASTER] Uprising: Crimson Fang
50 Legacy Points
This achievement is unlocked for completing uprising Crimson Fang once in [MASTER] difficulty. The enemies needed to complete this are;
Elarea Aldraste the Red Huntess | Jor "Oneshot" Mesok | KT-55 and PR-98 | Takkan Russco
100 Legacy Points
This achievement is unlocked for completing uprising Crimson Fang once in [MASTER] difficulty without dying. It seems that the legacy points and achievement are not accessible at this time. The activity needed to complete this is;
[MASTER] Uprising: Crimson Fang
20 Legacy Points | 20 Legacy Points | 20 Legacy Points | 20 Legacy Points
These achievements are unlocked for defeating Jor "Oneshot" Mesok, Takkan Russco, KT-55 and PR-98, and Elarea Aldraste the Red Huntess each once in [VETERAN] difficulty. The activity needed to complete these is;
[VETERAN] Uprising: Crimson Fang
20 Legacy Points
This achievement is unlocked for completing uprising Crimson Fang once in [VETERAN] difficulty. The enemies needed to complete this are;
Elarea Aldraste the Red Huntess | Jor "Oneshot" Mesok | KT-55 and PR-98 | Takkan Russco
10 Legacy Points | 10 Legacy Points | 10 Legacy Points | 10 Legacy Points
These achievements are unlocked for defeating Jor "Oneshot" Mesok, Takkan Russco, KT-55 and PR-98, and Elarea Aldraste the Red Huntess each once in [STORY] difficulty. The activity needed to complete these is;
[STORY] Uprising: Crimson Fang
10 Legacy Points
This achievement is unlocked for completing uprising Crimson Fang once in [STORY] difficulty. The enemies needed to complete this are;
Elarea Aldraste the Red Huntess | Jor "Oneshot" Mesok | KT-55 and PR-98 | Takkan Russco
10 Legacy Points
This achievement is unlocked for killing 1,000 enemy combatants in any difficulty. Although it requires a high number of deaths, this is easily completed in 3 runs, one on each difficult level. The enemies needed to complete this are;
Elarea Aldraste the Red Huntress | Gunslinger | Jor "Oneshot" Mesok | KT-55 | Mercenary
Mercenary Brawler | Mercenary Cannoneer | Patron | PR-98 | Shield Commando | Smuggler
Specialist Brawler | Specialist Gunslinger | Specialist Hunter | Specialist Trooper | Takkan Russco
Technician | Thug
10 Legacy Points | Grants Item: Alem "Whisper" Reesus Holo on completion
This achievement is unlocked for keeping Alem "Whisper" Reesus alive during the bar fight in any difficulty. This is easiest done in [STORy] difficulty as the adds will deal the least amount of damage and have the lowest health, but this is pretty easy to get in any difficulty mode. The activity needed to complete this is;
Swift and Silent
10 Legacy Points
This achievement is unlocked for locating the SIS Agent once in any difficulty. The agent is in the rafters in the hallway after the cantina where you encounter Alem, and before the hangar with the boss fight with Elarea. There is a Malfunctioning Power Coupler towards the back of the hallway, further from the hangar entrance. The grapple point can be finicky sometimes, and if you fall be sure you heal yourself, or you will die if you fall a second time. You just need to get within a few meters of the agent in the rafters for the achievement to trigger. The activities needed to complete this is;
[STORY] Uprising: Crimson Fang | [VETERAN] Uprising: Crimson Fang | [MASTER] Uprising: Crimson Fang