Here is the full list of all 49 Agents of Mayhem achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Take over an Outpost from LEGION.
Destroy a Drop Pod Launcher Emplacement.
Swap out an agent's weapon with a new look.
Equip an Upgrade Core to any agent.
Equip your first gadget onto any agent.
Warp into the ARK for the first time.
Find and open a large loot chest.
Complete "Operation: Spinoff."
Complete "Operation: Heaven Sent."
Complete "Operation: Star Power."
Complete "Operation: Machine Man."
Complete "Operation: Red Queen."
Complete "Operation: Madhouse."
Complete "Operation: Damocles."
Use mission replay to replay and complete 3 missions.
Take over each type of emplacement location.
Complete LEGION Alert Level by defeating the LEGION Captain.
Destroy a Hate Machine Emplacement.
Destroy a Ice Barrage Emplacement.
Destroy a Gravity Dominator.
Destroy a Dark Matter Fracking Station.
Destroy a Golem in the open world.
Unlock 5 Warp Points through open world gameplay.
Enter a secret room inside a LEGION lair.
Enter a secret room, inside a secret room, inside a LEGION lair.
Fully deck out Carnage a Trois in their signature outfits.
Fully deck out Franchise Force in their signature outfits.
Fully deck out the Bombshells in their signature outfits.
Fully deck out Firing Squad in their signature outfits.
Call in an agent vehicle for the first time.
Build your first vehicle through blueprints.
Run over Legion 10 times.
Complete a 360 in the air while in a vehicle.
Deploy your first agent to any LEGION region.
Complete 15 Connected Contracts.
Complete 30 MAYHEM & Agent Contracts.
Use Gremlin Tech for the first time.
Jump agent vehicle 50 meters in one jump.
Unlock and Complete all standard VR room training programs.
Complete a LEGION lair for the first time in Seoul.
Hit 10 jumps in the city.
Get 15 "All Perfect" hacks.
Collect all collectible Shards in game.
Fully upgrade all areas of the ARK.
Collect all agent vehicles.
Complete all Operations on Difficulty Level 7+.
Complete the Moscow Global Offensive.
Reach level 40 on any agent
Complete all agent personal missions and get all agents to level 20.