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