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 10 Troll Pathfinders while they're treading on ice.
Find the elusive acorn.
Kill 15 Wererats before they sicken any soldier.
Complete the campaign.
Kill 50 enemies by poison damage.
Open 5 information cards.
Disintegrate 50 or more enemies.
Earn 45 stars.
Defeat Gul'Thak and its minions.
Teleport 250 or more enemies.
Polymorph 50 enemies into sheep.
Hold 500 or more enemies with Wrath of the Forest.
Change soldiers' rally point 200 times.
Kill 300 enemies with electricity.
Have your Paladins perform 100 Holy Strikes.
Have your Paladins heal a total of 7.000 life.
Recruit max elves at The Silveroak Outpost.
Catch a fish.
Free the sasquatch on the Icewind Pass.
Defeat Vez'nan.
Build all 8 towers specializations.
Have a single barbarian kill 10 enemies.
Kill 10.000 enemies.
Earn 30 stars.
Throw 500 or more axes.
Have your soldiers survive the explosion of 300 demons.
Have your soldiers regenerate a total of 50.000 life.
Defeat J.T.
Train 1.00 soldiers.
Send 1.000 soldiers to their deaths.
Build 150 towers.
Have at least 3 Imperial Guards survive in the Citadel.
Defeat The Juggernaut
Train a hero up to max level.
Build 100 towers.
Earn 15 stars.
Upgrade all basic tower types to level3.
Kill 100 enemies with meteor showers.
Kill 2.500 enemies
Call a wave within 3 seconds of the icon showing up.
Call all waves early in a single mission.
Call 10 waves early.
Train a hero up to level 5.
Build 30 towers.
Use Rain of Fire 5 times in a single stage.
Kill 500 enemies.
Kill one enemy.
Sell 30 towers.
Sell 5 towers in a single mission.
Drop 1.000 or more bomblets with the cluster bomb.
Summon 5 rock elementals in any one stage.
Build 4 Tesla towers in any stage.
Shoot 100 missiles.
Snipe 50 enemies.
Kill 10 or more sheep with your hands.
Complete all heroic stages.
Complete all iron stages.
Defeat Sarelgaz and its minions.
Help Fredo escape.
Defeat Greenmuck and its minions.
Do not let The Kingpin escape.
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.
Have your Elves deal 10000 points of damage.
Capture the attention of the mysterious crow.
Discover the hidden monster under water.
Defeat Lord Blackburn to avoid war between kingdoms.
Find the ninja master rat.
Complete the campaign in Veteran mode.
Fire the Sunray 20 times.