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