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To get a full list of environment variables, use GetEnvironmentStrings function. But it is necessary to process result.

procedure TForm1.Button1Click(Sender: TObject);
var
  Variable: Boolean;
  Str: PChar;
  Res: string;
begin
  Str:=GetEnvironmentStrings;
  Res:='';
  Variable:=False;
  while True do begin
    if Str^=#0 then
    begin
      if Variable then Memo1.Lines.Add(Res);
      Variable:=True;
      Inc(Str);
      Res:='';
      if Str^=#0 then
        Break
      else
        Res:=Res+str^;
    end
    else
      if Variable then Res:=Res+Str^;
    Inc(str);
  end;
end;

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Win32 programmer's reference

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