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