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