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