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