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