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