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