The Bavarium Sea Heist Add-on for Just Cause 3 has 6 achievements.
Defeat 5 enemy helicopters with the Rocket Boat.
Beat the last mission of the Bavarium Sea Heist expansion and complete the story arc.
Defeat 1 enemy helicopter using the eDEN Spark.
Get the Rocket Boat, also known as "The Loochador".
Defeat 10 enemy vehicles while in the air with the Rocket Boat.
Defeat 10 enemies with the same eDEN Spark strike.