Here is the full list of all 74 Kingdom Rush achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Defeat Gul'Thak and its minions.
Teleport 250 or more enemies.
Build all 8 towers specializations.
Call a wave within 3 seconds of the icon showing up.
Do not let The Kingpin escape.
Complete the campaign.
Earn 30 stars.
Defeat Vez'nan.
Build 4 Tesla towers in any stage.
Have your soldiers survive the explosion of 300 demons.
Train 1.00 soldiers.
Kill 10.000 enemies.
Have your soldiers regenerate a total of 50.000 life.
Kill 300 enemies with electricity.
Upgrade all basic tower types to level3.
Sell 5 towers in a single mission.
Defeat J.T.
Send 1.000 soldiers to their deaths.
Disintegrate 50 or more enemies.
Have a single barbarian kill 10 enemies.
Train a hero up to max level.
Kill 100 enemies with meteor showers.
Build 150 towers.
Earn 15 stars.
Have at least 3 Imperial Guards survive in the Citadel.
Defeat The Juggernaut
Kill 2.500 enemies
Build 100 towers.
Train a hero up to level 5.
Call 10 waves early.
Use Rain of Fire 5 times in a single stage.
Build 30 towers.
Open 5 information cards.
Kill 500 enemies.
Call all waves early in a single mission.
Kill one enemy.
Change soldiers' rally point 200 times.
Earn 45 stars.
Sell 30 towers.
Recruit max elves at The Silveroak Outpost.
Free the sasquatch on the Icewind Pass.
Catch a fish.
Polymorph 50 enemies into sheep.
Hold 500 or more enemies with Wrath of the Forest.
Have your Paladins heal a total of 7.000 life.
Have your Paladins perform 100 Holy Strikes.
Drop 1.000 or more bomblets with the cluster bomb.
Summon 5 rock elementals in any one stage.
Kill 50 enemies by poison damage.
Shoot 100 missiles.
Snipe 50 enemies.
Throw 500 or more axes.
Kill 10 or more sheep with your hands.
Complete all heroic stages.
Complete all iron stages.
Defeat Sarelgaz and its minions.
Help Fredo escape.
Defeat Greenmuck and its minions.
Defeat 10 Troll Pathfinders while they're treading on ice.
Find the elusive acorn.
Find the 5 legendary lost ice-shrooms.
Defeat Ulguk-Hai the Troll Warlord.
Defeat 9 legions before they replicate.
Defeat Moloch the Demon Overlord.
Defeat Myconid, the Rotten Fungus.
Kill 25 Shrooms without them poisoning your soldiers.
Have your Elves deal 10000 points of damage.
Capture the attention of the mysterious crow.
Discover the hidden monster under water.
Defeat Lord Blackburn to avoid war between kingdoms.
Find the ninja master rat.
Kill 15 Wererats before they sicken any soldier.
Complete the campaign in Veteran mode.
Fire the Sunray 20 times.