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