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