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