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