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