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