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