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