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