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