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