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