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