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.
Defeat Gul'Thak and its minions.
Have your Paladins heal a total of 7.000 life.
Build 4 Tesla towers in any stage.
Have your soldiers survive the explosion of 300 demons.
Drop 1.000 or more bomblets with the cluster bomb.
Earn 45 stars.
Summon 5 rock elementals in any one stage.
Disintegrate 50 or more enemies.
Teleport 250 or more enemies.
Throw 500 or more axes.
Sell 5 towers in a single mission.
Sell 30 towers.
Recruit max elves at The Silveroak Outpost.
Defeat 9 legions before they replicate.
Complete the campaign.
Defeat Vez'nan.
Hold 500 or more enemies with Wrath of the Forest.
Kill 300 enemies with electricity.
Kill 10.000 enemies.
Have at least 3 Imperial Guards survive in the Citadel.
Build all 8 towers specializations.
Snipe 50 enemies.
Earn 30 stars.
Defeat J.T.
Have a single barbarian kill 10 enemies.
Have your soldiers regenerate a total of 50.000 life.
Train 1.00 soldiers.
Change soldiers' rally point 200 times.
Defeat The Juggernaut
Send 1.000 soldiers to their deaths.
Have your Paladins perform 100 Holy Strikes.
Kill 50 enemies by poison damage.
Train a hero up to max level.
Use Rain of Fire 5 times in a single stage.
Kill 2.500 enemies
Kill 100 enemies with meteor showers.
Earn 15 stars.
Upgrade all basic tower types to level3.
Build 150 towers.
Build 100 towers.
Train a hero up to level 5.
Open 5 information cards.
Kill 500 enemies.
Build 30 towers.
Call 10 waves early.
Call a wave within 3 seconds of the icon showing up.
Call all waves early in a single mission.
Kill one enemy.
Free the sasquatch on the Icewind Pass.
Catch a fish.
Polymorph 50 enemies into sheep.
Shoot 100 missiles.
Kill 10 or more sheep with your hands.
Complete all heroic stages.
Complete all iron stages.
Defeat Sarelgaz and its minions.
Help Fredo escape.
Defeat Greenmuck and its minions.
Do not let The Kingpin escape.
Defeat 10 Troll Pathfinders while they're treading on ice.
Find the elusive acorn.
Find the 5 legendary lost ice-shrooms.
Defeat Ulguk-Hai the Troll Warlord.
Defeat Moloch the Demon Overlord.
Defeat Myconid, the Rotten Fungus.
Kill 25 Shrooms without them poisoning your soldiers.
Have your Elves deal 10000 points of damage.
Capture the attention of the mysterious crow.
Discover the hidden monster under water.
Defeat Lord Blackburn to avoid war between kingdoms.
Find the ninja master rat.
Kill 15 Wererats before they sicken any soldier.
Complete the campaign in Veteran mode.
Fire the Sunray 20 times.