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