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