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