Here is the full list of all 52 Bloons Monkey City achievements.
Capture 2000 pieces of land of any kind
Successfully defend against 2,500 Monkey v Monkey attacks
Pop 1,000,000 Lead Bloons
Have built simultaneously at least 1 of every Base, Upgrade, Special, MvM, and Resource building available
Capture one of each: Wattle Trees, Tranquil Glade, Glacier, Shipwreck, Sticky Sap Plant, Phase Crystal, Temple Ruins, and MOAB Graveyard
Get 10 treasure chests on a single map
Crank up to 5,000 total power for your city
Destroy 10,000 DDTs
Capture 100 mountain or volcano squares
Revenge 500 Monkey v Monkey attacks
Destroy 10,000 ZOMGs
Pop 1,000,000 Ceramic Bloons
Capture 100 river or lake squares
Pop 100,000,000 bloons of any type
Build up a bank balance of $200,000 City Cash
Pop 1,000,000 Camouflage Bloons
Destroy 10,000 BFBs
Capture 500 pieces of land of any kind
Reach 10000 City Honor
Successfully defend against 100 Monkey v Monkey attacks
Reach 7500 City Honor
Enable all bloon types for Monkey v Monkey, including all MOAB classes
Reach 5500 City Honor
Reach 4500 City Honor
Reach 3600 City Honor
Destroy 10,000 MOABs
Reach 2800 City Honor
Pillage $500,000 from other players
Reach 2100 City Honor
Reach 1500 City Honor
Revenge 25 Monkey v Monkey attacks
Reach 1000 City Honor
Reach 600 City Honor
Reach 300 City Honor
Win 10 Monkey v Monkey attacks in a row
Capture 250 pieces of land of any kind
Successfully defend against 10 Monkey v Monkey attacks in a row
Reach 100 City Honor
Pillage $10,000 from other players
Successfully defend against 3 Monkey v Monkey attacks in a row
Reach 50 City Honor
Destroy 1,000 MOABs
Win 20 Contested Territories
Win 10 Contested Territories
Participate in 10 Contested Territories
Win 5 Contested Territories
Have 100 monkeys ready for duty in the My Monkeys panel
Win 1 Contested Territory
Build up a bank balance of $10,000 City Cash
Supply your city with a total of 1,000 power
Capture 10 pieces of land of any kind