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