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