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