Arbitration will become optional for individual sexual harassment and sexual assault claims, Google said, enabling lawsuits on those matters.
"Google has never required confidentiality in the arbitration process and it still may be the best path for a number of reasons (eg personal privacy, predictability of process), but, we recognise that the choice should be up to you", he said in the memo.
Promising more transparency on how it handles harassment allegations, Pichai said Google will double down on its commitment to be a "representative, equitable, and respectful workplace".
The company will also revise the manner in which it will probe employee concerns, including streamlining reporting channels, allowing staff to be accompanied by support persons and offering extra care and resources like counselling and career support during and after the process.
Google will also be expanding its Investigations Report to include a count of "substantiated or partially substantiated" claims over time, as well as trends, disciplinary actions, and substantiation percentages.
Updates and expansion of Google's mandatory sexual harassment training.
"Harassment is never acceptable and alcohol is never an excuse", Mr Pichai wrote.
"But the issues that contributed to the walkout at Google - the company's controversial work with the Pentagon on artificial intelligence, its apparent willingness to build a censored search engine for China, and above all its handling of sexual harassment accusations against senior managers - proved too large for any one worker to confront alone, even if that worker made mid-six figures", he continued.
Noting that in 20 per cent of harassment reports, the perpetrator had been drinking alcohol, the company says it expects corporate leaders - directors, VPs, and SVPs - to take steps to limit excessive drinking during company-related activities.
A massive turnout at the "Googleplex" in Silicon Valley was the final stage of a global walkout that began in Asia and spread to Google offices in Europe.
Pichai outlined the changes, which align with some of the demands put forward by protesters. "We've always been a vanguard company, so if we don't lead the way, nobody else will".
Geremia says the anger of those who walked out highlights that more women and minorities are needed in tech, but that need isn't unique to the sector.
More widely, Google's move to end forced arbitration for sexual harassment claims may energise employees at other firms to demand the same.