The Danger Rising Add-on for Just Cause 4 has 8 achievements worth 500 gamerscore.
Defeat Emerson Miller
Ride a friendly Agency drone for 1,000 meters, without getting off it
Ride the Hoverboard for a total of 10,000 meters (electro-mag cables don't count!)
Reach 200 km/h with the Hoverboard for 10 seconds while grappled to a vehicle
Grapple to an Agent who's reeling through the air, and reel-kick them
Defeat an Agent riding an Agency drone while riding an Agency drone yourself
Defeat 10 enemies during a single Agency drone ride
Complete all Agency Hoverboard Courses in 20 seconds or less