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