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