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