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