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.
Drop 1.000 or more bomblets with the cluster bomb.
Defeat Lord Blackburn to avoid war between kingdoms.
Discover the hidden monster under water.
Capture the attention of the mysterious crow.
Kill 50 enemies by poison damage.
Kill 15 Wererats before they sicken any soldier.
Defeat Myconid, the Rotten Fungus.
Kill 25 Shrooms without them poisoning your soldiers.
Defeat Greenmuck and its minions.
Defeat Moloch the Demon Overlord.
Defeat 9 legions before they replicate.
Defeat Ulguk-Hai the Troll Warlord.
Find the 5 legendary lost ice-shrooms.
Defeat 10 Troll Pathfinders while they're treading on ice.
Do not let The Kingpin escape.
Defeat Sarelgaz and its minions.
Polymorph 50 enemies into sheep.
Snipe 50 enemies.
Fire the Sunray 20 times.
Complete all iron stages.
Summon 5 rock elementals in any one stage.
Defeat Gul'Thak and its minions.
Teleport 250 or more enemies.
Disintegrate 50 or more enemies.
Have your Elves deal 10000 points of damage.
Complete the campaign.
Complete all heroic stages.
Shoot 100 missiles.
Build 4 Tesla towers in any stage.
Kill 300 enemies with electricity.
Have your Paladins perform 100 Holy Strikes.
Earn 45 stars.
Kill 10.000 enemies.
Train 1.00 soldiers.
Sell 30 towers.
Recruit max elves at The Silveroak Outpost.
Find the ninja master rat.
Find the elusive acorn.
Help Fredo escape.
Defeat Vez'nan.
Hold 500 or more enemies with Wrath of the Forest.
Throw 500 or more axes.
Have your soldiers survive the explosion of 300 demons.
Have your Paladins heal a total of 7.000 life.
Send 1.000 soldiers to their deaths.
Earn 30 stars.
Build all 8 towers specializations.
Change soldiers' rally point 200 times.
Defeat J.T.
Have your soldiers regenerate a total of 50.000 life.
Free the sasquatch on the Icewind Pass.
Sell 5 towers in a single mission.
Have a single barbarian kill 10 enemies.
Kill 100 enemies with meteor showers.
Kill 2.500 enemies
Upgrade all basic tower types to level3.
Build 150 towers.
Have at least 3 Imperial Guards survive in the Citadel.
Defeat The Juggernaut
Use Rain of Fire 5 times in a single stage.
Build 100 towers.
Earn 15 stars.
Train a hero up to max level.
Call a wave within 3 seconds of the icon showing up.
Train a hero up to level 5.
Catch a fish.
Build 30 towers.
Open 5 information cards.
Kill 500 enemies.
Call 10 waves early.
Kill 10 or more sheep with your hands.
Call all waves early in a single mission.
Kill one enemy.