Here is the full list of all 35 Natti achievements.
Acquire 10 tower gears.
Defeat Ziggy the Hellfire.
Acquire an equipment ability.
Upgrade a tower to final state in one battle. (excluding the basic equipment)
Use player spells for 10 times.
Defeat Sinny the Skull crusher.
Defeat Mugi the Imperfect one.
Defeat Summus the Beast master.
Clear a game.
Acquire 100 tower gears.
Lose a game at the first wave of the enemy.
Defeat Sinny without using a magic tower.
Defeat Mugi without using an archers tower.
Defeat Summus without using an artillery tower.
Build a tower in every slot.
Upgrade 5 towers to final state in one battle.(excluding basic equipment)
Upgrade 10 towers to final state in one battle. (excluding basic equipment)
Learn all of Boozer’s skills.
Acquire equipment abilities 100 times.
Use player spells for 100 times.
Complete a game without losing any HP in battle.
Deal 10,000 DOT damage.
Deal 100,000 DOT damage.
Deal 10,000 critical damage.
Deal 100,000 critical damage.
Deal 1,000 or more damage in one hit.
Deal 3,000 or more damage in one hit.
Level up boozer to max level.
Defeat Ziggy without using an archer tower.
Upgrade a gear.
Upgrade gears of every type at least once.
Win an elite battle.
Win 5 elite battles in a single run.
Defeat Gwis the Walking mountain.
Defeat Gwis without using a magic tower.