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