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