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