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