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