Here is the full list of all 66 Goblins Keep Coming - there are Tower Defense achievements.
Kill 10000 Goblins
build 100 Towers Level 2
Win 100 waves
Survive 100 Waves in a Row
Win 80 waves without taking a hit
Kill 10 King Goblins
Burn 1000 Goblins
Win 50 waves
Survive 50 Waves in a Row
Win 50 waves without taking a hit
Kill 1000 Warrior Goblins
Build 10 Mines
Freeze 1000 Goblins
Build 100 Towers Level 1
Kill 1000 Wanderer Goblins
Kill 1000 Bomber Goblins
Build 10 Fire Towers
Build 10 Ice Towers
Win 30 waves without taking a hit
Unlock Desert Field
Kill 1000 Goblins
Collect a total of 1000 gold from mines
Burn 100 Goblins
Freeze 100 Goblins
Raise 10.000 gold
Kill 10 Bomber Goblins
Kill 100 Bomber Goblins
Build 100 Towers
Kill 100 Warrior Goblins
Freeze 10 Goblins
Unlock Volcano Field
Burn 10 Goblins
Kill 10 Warrior Goblins
Build 10 Towers Level 3
Build 10 Towers Level 2
Win 10 waves
Survive 10 Waves in a Row
Win 10 waves without taking a hit
Reach wave 10 using less than 500 gold
Build 10 Towers Level 1
Unlock Winter Field
Kill 100 Goblins
Kill 100 Wanderer Goblins
Raise 1000 gold
Build 10 Towers
Kill 10 Wanderer Goblins
Build 1000 Towers
Build 1000 Towers Level 1
Build 1000 Towers Level 2
Build 100 Towers Level 3
Build 1000 Towers Level 3
Build 100 Mines
Build 1000 Mines
Kill 100 King Goblins
Kill 1000 King Goblins
Have 10.000 golds in a match
Spend 50.000 golds
Collect a total of 10.000 gold from mines
Build 100 Fire Towers
Build 1000 Fire Towers
Build 100 Ice towers
Build 1000 Ice towers
Repair the castle 10 times
Repair the castle 50 times
Repair the castle 100 times
Used the Second Chance to try again!