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