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.
Reach level 40 on any agent
Fully upgrade all areas of the ARK.
Enter a secret room inside a LEGION lair.
Hit 10 jumps in the city.
Run over Legion 10 times.
Get 15 "All Perfect" hacks.
Destroy a Hate Machine Emplacement.
Build your first vehicle through blueprints.
Find and open a large loot chest.
Take over each type of emplacement location.
Swap out an agent's weapon with a new look.
Deploy your first agent to any LEGION region.
Complete a LEGION lair for the first time in Seoul.
Complete LEGION Alert Level by defeating the LEGION Captain.
Jump agent vehicle 50 meters in one jump.
Take over an Outpost from LEGION.
Destroy a Drop Pod Launcher Emplacement.
Use Gremlin Tech for the first time.
Warp into the ARK for the first time.
Call in an agent vehicle for the first time.
Equip an Upgrade Core to any agent.
Equip your first gadget onto any agent.
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.
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 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.
Complete a 360 in the air while in a vehicle.
Complete 15 Connected Contracts.
Complete 30 MAYHEM & Agent Contracts.
Unlock and Complete all standard VR room training programs.
Collect all collectible Shards in game.
Collect all agent vehicles.
Complete all Operations on Difficulty Level 7+.
Complete the Moscow Global Offensive.
Complete all agent personal missions and get all agents to level 20.