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