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