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 soldiers survive the explosion of 300 demons.
Have your Elves deal 10000 points of damage.
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.
Defeat Ulguk-Hai the Troll Warlord.
Find the 5 legendary lost ice-shrooms.
Defeat 10 Troll Pathfinders while they're treading on ice.
Defeat Gul'Thak and its minions.
Do not let The Kingpin escape.
Defeat Moloch the Demon Overlord.
Change soldiers' rally point 200 times.
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 Sarelgaz and its minions.
Find the ninja master rat.
Help Fredo escape.
Find the elusive acorn.
Free the sasquatch on the Icewind Pass.
Complete all iron stages.
Have a single barbarian kill 10 enemies.
Complete all heroic stages.
Send 1.000 soldiers to their deaths.
Train 1.00 soldiers.
Build 4 Tesla towers in any stage.
Shoot 100 missiles.
Earn 45 stars.
Kill 10 or more sheep with your hands.
Complete the campaign.
Defeat Vez'nan.
Kill 300 enemies with electricity.
Drop 1.000 or more bomblets with the cluster bomb.
Snipe 50 enemies.
Kill 50 enemies by poison damage.
Recruit max elves at The Silveroak Outpost.
Kill 100 enemies with meteor showers.
Have your soldiers regenerate a total of 50.000 life.
Disintegrate 50 or more enemies.
Teleport 250 or more enemies.
Build all 8 towers specializations.
Summon 5 rock elementals in any one stage.
Kill 10.000 enemies.
Earn 30 stars.
Polymorph 50 enemies into sheep.
Have your Paladins perform 100 Holy Strikes.
Defeat J.T.
Throw 500 or more axes.
Hold 500 or more enemies with Wrath of the Forest.
Have your Paladins heal a total of 7.000 life.
Sell 30 towers.
Sell 5 towers in a single mission.
Build 150 towers.
Earn 15 stars.
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.
Build 100 towers.
Upgrade all basic tower types to level3.
Use Rain of Fire 5 times in a single stage.
Call a wave within 3 seconds of the icon showing up.
Kill 2.500 enemies
Call 10 waves early.
Train a hero up to level 5.
Catch a fish.
Build 30 towers.
Open 5 information cards.
Kill 500 enemies.
Kill one enemy.
Complete the campaign in Veteran mode.
Fire the Sunray 20 times.