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