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.
Discover the hidden monster under water.
Capture the attention of the mysterious crow.
Fire the Sunray 20 times.
Find the ninja master rat.
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.
Defeat Lord Blackburn to avoid war between kingdoms.
Find the 5 legendary lost ice-shrooms.
Defeat Ulguk-Hai the Troll Warlord.
Defeat Greenmuck and its minions.
Kill 15 Wererats before they sicken any soldier.
Defeat Sarelgaz and its minions.
Help Fredo escape.
Do not let The Kingpin escape.
Drop 1.000 or more bomblets with the cluster bomb.
Defeat 9 legions before they replicate.
Complete all iron stages.
Complete all heroic stages.
Summon 5 rock elementals in any one stage.
Sell 30 towers.
Shoot 100 missiles.
Free the sasquatch on the Icewind Pass.
Defeat Gul'Thak and its minions.
Have your Paladins perform 100 Holy Strikes.
Polymorph 50 enemies into sheep.
Build 4 Tesla towers in any stage.
Defeat 10 Troll Pathfinders while they're treading on ice.
Snipe 50 enemies.
Find the elusive acorn.
Sell 5 towers in a single mission.
Have your Paladins heal a total of 7.000 life.
Hold 500 or more enemies with Wrath of the Forest.
Kill 50 enemies by poison damage.
Build all 8 towers specializations.
Kill 300 enemies with electricity.
Throw 500 or more axes.
Train a hero up to max level.
Have a single barbarian kill 10 enemies.
Catch a fish.
Change soldiers' rally point 200 times.
Kill 10 or more sheep with your hands.
Earn 45 stars.
Disintegrate 50 or more enemies.
Complete the campaign.
Defeat Vez'nan.
Kill 10.000 enemies.
Teleport 250 or more enemies.
Have your soldiers survive the explosion of 300 demons.
Have your soldiers regenerate a total of 50.000 life.
Kill 100 enemies with meteor showers.
Earn 30 stars.
Defeat J.T.
Upgrade all basic tower types to level3.
Train 1.00 soldiers.
Send 1.000 soldiers to their deaths.
Train a hero up to level 5.
Earn 15 stars.
Build 100 towers.
Defeat The Juggernaut
Kill 2.500 enemies
Build 150 towers.
Recruit max elves at The Silveroak Outpost.
Have at least 3 Imperial Guards survive in the Citadel.
Use Rain of Fire 5 times in a single stage.
Open 5 information cards.
Kill 500 enemies.
Build 30 towers.
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.