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