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