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