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