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