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.
Have your Elves deal 10000 points of damage.
Change soldiers' rally point 200 times.
Complete all iron stages.
Complete all heroic stages.
Complete the campaign.
Kill 50 enemies by poison damage.
Build 4 Tesla towers in any stage.
Shoot 100 missiles.
Summon 5 rock elementals in any one stage.
Throw 500 or more axes.
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.
Disintegrate 50 or more enemies.
Have your Paladins heal a total of 7.000 life.
Have your Paladins perform 100 Holy Strikes.
Polymorph 50 enemies into sheep.
Train a hero up to max level.
Capture the attention of the mysterious crow.
Find the ninja master rat.
Sell 30 towers.
Defeat Moloch the Demon Overlord.
Snipe 50 enemies.
Defeat 9 legions before they replicate.
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.
Kill 15 Wererats before they sicken any soldier.
Defeat Ulguk-Hai the Troll Warlord.
Defeat 10 Troll Pathfinders while they're treading on ice.
Find the 5 legendary lost ice-shrooms.
Find the elusive acorn.
Defeat Sarelgaz and its minions.
Help Fredo escape.
Earn 45 stars.
Do not let The Kingpin escape.
Defeat Gul'Thak and its minions.
Defeat Vez'nan.
Kill 300 enemies with electricity.
Build all 8 towers specializations.
Kill 10.000 enemies.
Earn 30 stars.
Have your soldiers survive the explosion of 300 demons.
Defeat J.T.
Have your soldiers regenerate a total of 50.000 life.
Have a single barbarian kill 10 enemies.
Free the sasquatch on the Icewind Pass.
Train 1.00 soldiers.
Kill 2.500 enemies
Build 150 towers.
Have at least 3 Imperial Guards survive in the Citadel.
Defeat The Juggernaut
Send 1.000 soldiers to their deaths.
Upgrade all basic tower types to level3.
Build 100 towers.
Earn 15 stars.
Kill 100 enemies with meteor showers.
Recruit max elves at The Silveroak Outpost.
Train a hero up to level 5.
Open 5 information cards.
Use Rain of Fire 5 times in a single stage.
Build 30 towers.
Kill 500 enemies.
Call 10 waves early.
Catch a fish.
Sell 5 towers in a single mission.
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.