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