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