Full list of all 61 Just Cause 4 achievements worth 2,500 gamerscore. It takes around 50-60 hours to unlock all of the achievements in the base game.
The base game contains 34 achievements worth 1,000 Gamerscore, and there are 3 DLC packs containing 27 achievements worth 1,500 Gamerscore.
Crashed into a flying airplane with your own plane
Recruited every Pilot
Reached Army of Chaos Level 14
Stood on foot at the highest point in Solís
Helped Garland King finally finish her picture
Used only the Air Lifter for 15 non-consecutive minutes
Got on the Leaderboard for every Feat
Unlocked every Grappling Hook Mod
Uncovered the mysteries of the Lost Tomb of Otorongo
Destroyed every Surveillance Airship
Discovered 50% of all discoverable Locations
Secured every Region
Removed all rigged vehicles from the harbors of Solís
Helped Sargento stop an invasion of Black Hand reinforcements
Secured Illapa
Finished Operation Sandstinger
Secured every Factory
Finished Operation Thunderbarge
Secured all Small Arms and Heavy Weapons Blueprints
Destroyed a vehicle with the PBX Auto-Slug 4 shotgun's "Ricochet" secondary fire
Finished Operation Windwalker
Helped Sargento with his ambush, met Javi Huerta, and got carried away by Garland King
Used only the Booster for 15 non-consecutive minutes
Increased your Army of Chaos Level by filling up the Chaos bar
Used only the Retract for 15 non-consecutive minutes
Earn all Just Cause 4 Achievements
Discover every Location in the game
Secure every Supply Drop Blueprint
Beat someone's score while manually tracking the Feat
Uncover every Ancient Statue
Turn 10 Black Hand into Cows using the Cow Gun in a single session
Film every Speed Stunt
Film every Wingsuit Stunt
Film every Vehicle Stunt
Earned a B Rank in the Trial of Initiation
Earn a B Rank in the Trial of Triumph
Earn a B Rank in LNP's Isla Intensa Trial Run
Earn a B Rank in the Gearheads' Godsbowl Trial Rampage
Earn a B Rank in Los Artistas' La Ratonera Survival Trial
Destroy 15 vehicles during a single challenge
Destroy 25 vehicles during a single challenge
Drive through all AR tiger images in the Solino Underground's challenges
Earn an S Rank in every course in the Solino Underground
Finish The Artifact
Finish Extermination
Purge the Infestation on the Mainland
Expel the Infestation at the Farm
Exorcise the Infestation at the Church
Eradicate the Infestation at the Compound
Liquidate the Infestation at the Lake
Obliterate the Infestation at the Crash
Abolish the Infestation on the Mountain
Create a Cow Demon
Grapple to an Agent who's reeling through the air, and reel-kick them
Ride a friendly Agency drone for 1,000 meters, without getting off it
Defeat an Agent riding an Agency drone while riding an Agency drone yourself
Defeat 10 enemies during a single Agency drone ride
Defeat Emerson Miller
Reach 200 km/h with the Hoverboard for 10 seconds while grappled to a vehicle
Ride the Hoverboard for a total of 10,000 meters (electro-mag cables don't count!)
Complete all Agency Hoverboard Courses in 20 seconds or less