Here is the full list of all 40 Cliff & Field Tower Defense achievements.
Get 1,000 total kills
Get 10,000 total kills
Get 50,000 total kills
Get 100,000 total kills
Get 250,000 total kills
Get 500,000 total kills
Get 1,000,000 total kills
Get 2,500,000 total kills
Get 6,000,000 total kills
Get 10,000,000 total kills
Build 100 towers
Build 1,000 towers
Build 2,500 towers
Build 6,000 towers
Build 10,000 towers
Build 25,000 towers
Build 100,000 towers
Build 1,000,000 towers
Complete 1 Daily Challenge
Complete 3 Daily Challenges
Complete 10 Daily Challenges
Complete 25 Daily Challenges
Complete 60 Daily Challenges
Complete 100 Daily Challenges
Complete 365 Daily Challenges
Complete 1,000 Daily Challenges
Complete 1 Weekly Challenge
Complete 3 Weekly Challenges
Complete 10 Weekly Challenges
Complete 25 Weekly Challenges
Complete 52 Weekly Challenges
Complete 100 Weekly Challenges
Complete 250 Weekly Challenges
Complete 500 Weekly Challenges
Complete 1 Monthly Challenge
Complete 3 Monthly Challenges
Complete 6 Monthly Challenges
Complete 12 Monthly Challenges
Complete 24 Monthly Challenges
Complete 100 Monthly Challenges