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