Full list of all 50 Just Cause achievements worth 1,000 gamerscore. It takes around 25-30 hours to unlock all of the achievements on Xbox 360.
Completed Story Mission 7
Completed Story Mission 14
Completed All Story Missions
Completed Race 4
Completed Race 9
Killed 250 Enemies
Killed 500 Enemies
Survived For 1 Minute With Maximum Wanted Level
Survived For 2 Minutes With Maximum Wanted Level
Survived For 5 Minutes With Maximum Wanted Level
Completed 20 Car-To-Car Jumps
Killed 100 Enemies
Complete 10 Side Missions
Liberate 11 Provinces In San Esperito
Liberate 22 Provinces In San Esperito
Liberate Every Province In San Esperito
Complete 15 Takeover Missions
Complete 30 Takeover Missions
Complete 45 Takeover Missions
Complete Collect Mission 1
Complete Collect Mission 2
Complete Collect Mission 3
Complete Collect Mission 4
Complete Collect Mission 5
Complete Collect Mission 6
Complete Collect Mission 7
Complete Collect Mission 8
Complete Collect Mission 9
Complete Collect Mission 10
Complete Collect Mission 11
Complete Collect Mission 12
Complete Collect Mission 13
Complete Every Race Mission
Complete Every Collect Mission
Complete 20 Side Missions
Complete 30 Side Missions
Complete 40 Side Missions
Complete 50 Side Missions
Complete Race 1
Complete Race 2
Complete Race 3
Complete Race 5
Complete Race 6
Complete Race 7
Complete Race 8
Complete 20 Land Vehicle Stunts
Complete 20 Sea Vehicle Stunts
Complete 20 Air Vehicle Stunts
Complete All Stunts
Base Jump From 1000 Meters Or Higher