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.
Defeat 9 legions before they replicate.
Complete the campaign.
Defeat Vez'nan.
Train a hero up to max level.
Have your soldiers survive the explosion of 300 demons.
Have your soldiers regenerate a total of 50.000 life.
Have a single barbarian kill 10 enemies.
Kill 100 enemies with meteor showers.
Teleport 250 or more enemies.
Kill 10.000 enemies.
Earn 30 stars.
Polymorph 50 enemies into sheep.
Kill 300 enemies with electricity.
Summon 5 rock elementals in any one stage.
Build 4 Tesla towers in any stage.
Build all 8 towers specializations.
Defeat J.T.
Have your Paladins heal a total of 7.000 life.
Have your Paladins perform 100 Holy Strikes.
Throw 500 or more axes.
Sell 30 towers.
Shoot 100 missiles.
Drop 1.000 or more bomblets with the cluster bomb.
Disintegrate 50 or more enemies.
Free the sasquatch on the Icewind Pass.
Have at least 3 Imperial Guards survive in the Citadel.
Defeat The Juggernaut
Hold 500 or more enemies with Wrath of the Forest.
Kill 50 enemies by poison damage.
Kill 2.500 enemies
Use Rain of Fire 5 times in a single stage.
Earn 15 stars.
Sell 5 towers in a single mission.
Build 150 towers.
Recruit max elves at The Silveroak Outpost.
Train a hero up to level 5.
Build 100 towers.
Upgrade all basic tower types to level3.
Open 5 information cards.
Build 30 towers.
Call 10 waves early.
Kill 500 enemies.
Kill 10 or more sheep with your hands.
Call all waves early in a single mission.
Call a wave within 3 seconds of the icon showing up.
Kill one enemy.
Change soldiers' rally point 200 times.
Earn 45 stars.
Train 1.00 soldiers.
Send 1.000 soldiers to their deaths.
Catch a fish.
Snipe 50 enemies.
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.