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