Here is the full list of all 40 XCOM: Chimera Squad achievements. It takes around 60-80 hours to unlock all of the achievements on Windows.
Complete all versions of each Faction’s Takedown mission over multiple campaigns.
Reach max rank with all Agents in a single campaign.
Use every type of Breach point.
Use Claymore to detonate a Shrapnel Bomb with another explosive.
Buy 20 unique Scavenger Market items in a single campaign.
Hack an enemy Android with Patchwork and trigger Self-Destruct.
Have Kinetic Armor on all 4 squad members at once.
Use Verge to do 10 or more damage with one Mindflay.
Relocate the same unit with Shelter and his ghost in one turn.
Fully upgrade an Android.
Complete every Spec Op at least once in a single campaign.
As Godmother, activate Overtime and down an enemy on both turns.
Complete an objective with an action from Terminal’s Cooperation.
Use Zephyr to hit 3 or more enemies with one use of Crowd Control.
Complete an encounter by only dealing damage with melee attacks.
Launch a mission with no human agents in the squad.
Complete 20 Assembly Projects in a single campaign.
Win the campaign on Impossible difficulty.
Win the campaign.
Use Torque to Tongue Pull an enemy into poison.
Complete the Progeny Investigation.
Equip an Epic Weapon.
Move a VIP with Shelter’s Relocate and Torque’s Tongue Pull.
Capture a Sorcerer.
Have Rank 3 Field Teams in all nine districts.
Complete the Gray Phoenix Investigation.
Complete all of one Agent’s class training.
Use every Agent in at least one mission.
Use Blueblood to hit 3 or more enemies with one Phase Lance shot.
Unlock all Field Abilities.
Clear an entire encounter during the Breach turn.
Capture a Praetorian.
Kill an enemy with Axiom while Berserk.
Have 8 Agents in the squad in a single campaign.
Complete a mission without killing a single enemy.
Complete the Sacred Coil Investigation.
Replace an Agent mid-mission with an Android.
Capture a Ronin.
Complete a mission with only one Agent left standing.
Complete the tutorial.