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