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