The Mech Land Assault Add-on for Just Cause 3 has 6 achievements worth 190 gamerscore.
Beat the last mission of the Mech Land Assault Expansion and complete the story arc.
Destroy 30 enemy vehicles using the Mech's Force Pulse.
Earn at least 1 Gear in all Challenges of the Mech Land Assault Expansion.
Earn 5 Gears in all Challenges of the Mech Land Assault Expansion.
Liberate 3 Detention Camps.
Hijack your first Mech.