Diablo 3 Witch Doctor Class Achievements Guide

Spirit Guide (10 Points)
Achievement Rewards: Banner Accent (Witch Doctor's Weaponry)
Complete Act IV with a Witch Doctor on Normal Difficulty

Dreamwalker (10 Points)
Complete Act IV with a Witch Doctor on Nightmare Difficulty

Speaker for the Dead (10 Points)
Complete Act IV with a Witch Doctor on Hell Difficulty

Shaper of the Unformed Land (10 Points)
Achievement Reward: Banner Sigil (Ghost Trance)
Complete Act IV with a Witch Doctor on Inferno Difficulty

Master of The Teganze (10 Points)
Reach level 60 with 2 Witch Doctors

Ceremonial Garb (10 Pts)
Equip a Ceremonial Knife, a Voodoo Mask, and a Mojo at the same time

You should get those items as drops or loot from creatures and/or chests as early as Act I, or you could always use Auction House.

Hotdogging (10 Points)
Summon 3 Zombie Dogs at the smae time without using the Summon Zombie Dog skill

Use Circle of Life (Level 10 Passive Skill) as your passive, other useful skills are Zombie Handler (Level 24 Passive), Sacrifice (Lvl 13 Terror Skill) with Next of Kin (Lvl 24 Rune), and Big Bad Voodoo (Level 25 Skill) with Boogie Man (Level 58 Rune). Easiest way to get achievement is to lure lots of smaller, lower level mobs, together and kill them with AOE attacks.

Puppet Master (10 Points)
Achievement Rewards: Banner Sigil (Fetish)
Have 7 pets and/or followers at the same time

Zombie Handler (Lvl 24 Passive Skill), and Fetish Army (Level 30 Skill) with Legion of Daggers (Level 46 Rune) can help you get this one.

Stop Hitting Yourself (10 Pts)
Cause 30 enemies to kill each other while confused

The level 22 skill Mass Confusion is useful for this achievement. Also you can use the Plague Toads rune "Addling Toads" (Level 51)

Not in Vain (10 Pts)
Kill 10 enemies with a single Sacrifice

Sacrifice is an Terror AOE skill unlocked at level 13. For the achievement, it is best used on large groups of lower level monsters.