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