Welcome to the guide for obtaining the "And Good Riddance!" achievement in Terraria. This achievement requires you to completely purify all corruption, crimson and hallow from your world

This is quite a time consuming achievement but this guide should help you speed things up a bit and go into the achievement with a strategy to tackle this!

Requirements:

All you need for this achievement is a Clentaminator & Green Solution! This means you should have a lot of coins stacked up in order to do this

Clentaminator:
Purchased from the Steampunker NPC for 2 Platinum Coins.

Green Solution:
Used to convert Corruption, Crimson, and Hallow back to normal. Purchased from the Steampunker during a Forest biome for 25 Silver Coins each.

Fly or walk around your world to locate all corrupted, crimson and hallow areas. These areas are typically identified by their distinctive backgrounds and unique enemy spawns.

Equip the Clentaminator and start spraying the Green Solution on the corrupted, crimson and hallow blocks. Move methodically to ensure you cover every inch of the affected areas. Don't forget to check underground! Corruption, crimson, and hallow can spread through caves and other subterranean spaces.

Make sure to purify the edges of your world, including the ocean biome and underworld. Corruption and crimson can spread to these areas, making it easy to miss spots.

After completing an initial pass, re-survey your world to check for any missed areas. It may take several passes to ensure all corrupted, crimson and hallow blocks are purified so make sure to check with the Dryad to see progress!

TLDR:
Step 1: Fly across the world with the Clentaminator using Green Solution.

Step 2: Focus on areas where Corruption, Crimson and Hallow typically spread:
- Forest edges.
- Underground entrance points.
- Jungle biome (as it can be difficult to clean once it gets infected)

Corruption, Crimson and Hallow spread underground, so dig tunnels or use the Clentaminator.

Pay special attention to:
Cavern layers.
Underground Jungle (Hallow/Corruption can invade).
Ice biomes.

The "And Good Riddance!" achievement is all about persistence and world management. With the right preparation and tools, you’ll eventually rid your Terraria world of all corruption and claim your hard-earned achievement.

Good luck!