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