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