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