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