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