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