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