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.
Find the ninja master rat.
Capture the attention of the mysterious crow.
Kill 15 Wererats before they sicken any soldier.
Find the elusive acorn.
Help Fredo escape.
Catch a fish.
Free the sasquatch on the Icewind Pass.
Kill 300 enemies with electricity.
Build 4 Tesla towers in any stage.
Earn 45 stars.
Recruit max elves at The Silveroak Outpost.
Defeat 9 legions before they replicate.
Complete the campaign.
Defeat Vez'nan.
Summon 5 rock elementals in any one stage.
Polymorph 50 enemies into sheep.
Teleport 250 or more enemies.
Have your Paladins heal a total of 7.000 life.
Hold 500 or more enemies with Wrath of the Forest.
Snipe 50 enemies.
Have your Paladins perform 100 Holy Strikes.
Kill 50 enemies by poison damage.
Train a hero up to max level.
Throw 500 or more axes.
Build all 8 towers specializations.
Have your soldiers survive the explosion of 300 demons.
Disintegrate 50 or more enemies.
Call all waves early in a single mission.
Sell 30 towers.
Sell 5 towers in a single mission.
Earn 30 stars.
Have at least 3 Imperial Guards survive in the Citadel.
Call a wave within 3 seconds of the icon showing up.
Defeat J.T.
Have a single barbarian kill 10 enemies.
Train a hero up to level 5.
Kill 10.000 enemies.
Earn 15 stars.
Defeat The Juggernaut
Have your soldiers regenerate a total of 50.000 life.
Upgrade all basic tower types to level3.
Train 1.00 soldiers.
Call 10 waves early.
Kill 100 enemies with meteor showers.
Send 1.000 soldiers to their deaths.
Build 150 towers.
Use Rain of Fire 5 times in a single stage.
Build 100 towers.
Kill 2.500 enemies
Open 5 information cards.
Build 30 towers.
Kill 500 enemies.
Kill one enemy.
Change soldiers' rally point 200 times.
Drop 1.000 or more bomblets with the cluster bomb.
Shoot 100 missiles.
Kill 10 or more sheep with your hands.
Complete all heroic stages.
Complete all iron stages.
Defeat Sarelgaz and its minions.
Defeat Gul'Thak 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 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.
Discover the hidden monster under water.
Defeat Lord Blackburn to avoid war between kingdoms.
Complete the campaign in Veteran mode.
Fire the Sunray 20 times.