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