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