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