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